diff --git a/src/main/java/ru/ulstu/paper/model/AutoCompleteData.java b/src/main/java/ru/ulstu/paper/model/AutoCompleteData.java
index b70a780..91c3bf4 100644
--- a/src/main/java/ru/ulstu/paper/model/AutoCompleteData.java
+++ b/src/main/java/ru/ulstu/paper/model/AutoCompleteData.java
@@ -1,42 +1,43 @@
 package ru.ulstu.paper.model;
 
 import java.util.ArrayList;
+import java.util.List;
 
 public class AutoCompleteData {
-    ArrayList<String> authors = new ArrayList<>();
-    ArrayList<String> publicationTitles = new ArrayList<>();
-    ArrayList<String> publishers = new ArrayList<>();
-    ArrayList<String> journalOrCollectionTitles = new ArrayList<>();
+    private List<String> authors = new ArrayList<>();
+    private List<String> publicationTitles = new ArrayList<>();
+    private List<String> publishers = new ArrayList<>();
+    private List<String> journalOrCollectionTitles = new ArrayList<>();
 
-    public ArrayList<String> getAuthors() {
+    public List<String> getAuthors() {
         return authors;
     }
 
-    public void setAuthors(ArrayList<String> authors) {
+    public void setAuthors(List<String> authors) {
         this.authors = authors;
     }
 
-    public ArrayList<String> getPublicationTitles() {
+    public List<String> getPublicationTitles() {
         return publicationTitles;
     }
 
-    public void setPublicationTitles(ArrayList<String> publicationTitles) {
+    public void setPublicationTitles(List<String> publicationTitles) {
         this.publicationTitles = publicationTitles;
     }
 
-    public ArrayList<String> getPublishers() {
+    public List<String> getPublishers() {
         return publishers;
     }
 
-    public void setPublishers(ArrayList<String> publishers) {
+    public void setPublishers(List<String> publishers) {
         this.publishers = publishers;
     }
 
-    public ArrayList<String> getJournalOrCollectionTitles() {
+    public List<String> getJournalOrCollectionTitles() {
         return journalOrCollectionTitles;
     }
 
-    public void setJournalOrCollectionTitles(ArrayList<String> journalOrCollectionTitles) {
+    public void setJournalOrCollectionTitles(List<String> journalOrCollectionTitles) {
         this.journalOrCollectionTitles = journalOrCollectionTitles;
     }
 }
diff --git a/src/main/java/ru/ulstu/paper/repository/ReferenceRepository.java b/src/main/java/ru/ulstu/paper/repository/ReferenceRepository.java
index 1d4321b..942a5b8 100644
--- a/src/main/java/ru/ulstu/paper/repository/ReferenceRepository.java
+++ b/src/main/java/ru/ulstu/paper/repository/ReferenceRepository.java
@@ -4,20 +4,20 @@ import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import ru.ulstu.paper.model.Reference;
 
-import java.util.ArrayList;
+import java.util.List;
 
 public interface ReferenceRepository extends JpaRepository<Reference, Integer> {
     void deleteById(Integer id);
 
     @Query("SELECT DISTINCT r.authors FROM Reference r")
-    ArrayList<String> findDistinctAuthors();
+    List<String> findDistinctAuthors();
 
     @Query("SELECT DISTINCT r.publicationTitle FROM Reference r")
-    ArrayList<String> findDistinctPublicationTitles();
+    List<String> findDistinctPublicationTitles();
 
     @Query("SELECT DISTINCT r.publisher FROM Reference r")
-    ArrayList<String> findDistinctPublishers();
+    List<String> findDistinctPublishers();
 
     @Query("SELECT DISTINCT r.journalOrCollectionTitle FROM Reference r where r.journalOrCollectionTitle <> ''")
-    ArrayList<String> findDistinctJournalOrCollectionTitles();
+    List<String> findDistinctJournalOrCollectionTitles();
 }
diff --git a/src/main/java/ru/ulstu/paper/service/PaperService.java b/src/main/java/ru/ulstu/paper/service/PaperService.java
index cfb1a0a..2393af4 100644
--- a/src/main/java/ru/ulstu/paper/service/PaperService.java
+++ b/src/main/java/ru/ulstu/paper/service/PaperService.java
@@ -146,13 +146,7 @@ public class PaperService {
     @Transactional
     public Reference updateReference(ReferenceDto referenceDto) {
         Reference updateReference = referenceRepository.findOne(referenceDto.getId());
-        updateReference.setAuthors(referenceDto.getAuthors());
-        updateReference.setJournalOrCollectionTitle(referenceDto.getJournalOrCollectionTitle());
-        updateReference.setPages(referenceDto.getPages());
-        updateReference.setPublicationTitle(referenceDto.getPublicationTitle());
-        updateReference.setPublicationYear(referenceDto.getPublicationYear());
-        updateReference.setPublisher(referenceDto.getPublisher());
-        updateReference.setReferenceType(referenceDto.getReferenceType());
+        copyFromDto(updateReference, referenceDto);
         referenceRepository.save(updateReference);
         return updateReference;
     }
@@ -160,17 +154,21 @@ public class PaperService {
     @Transactional
     public Reference createReference(ReferenceDto referenceDto) {
         Reference newReference = new Reference();
-        newReference.setAuthors(referenceDto.getAuthors());
-        newReference.setJournalOrCollectionTitle(referenceDto.getJournalOrCollectionTitle());
-        newReference.setPages(referenceDto.getPages());
-        newReference.setPublicationTitle(referenceDto.getPublicationTitle());
-        newReference.setPublicationYear(referenceDto.getPublicationYear());
-        newReference.setPublisher(referenceDto.getPublisher());
-        newReference.setReferenceType(referenceDto.getReferenceType());
+        copyFromDto(newReference, referenceDto);
         newReference = referenceRepository.save(newReference);
         return newReference;
     }
 
+    private Reference copyFromDto(Reference reference, ReferenceDto referenceDto) {
+        reference.setAuthors(referenceDto.getAuthors());
+        reference.setJournalOrCollectionTitle(referenceDto.getJournalOrCollectionTitle());
+        reference.setPages(referenceDto.getPages());
+        reference.setPublicationTitle(referenceDto.getPublicationTitle());
+        reference.setPublicationYear(referenceDto.getPublicationYear());
+        reference.setPublisher(referenceDto.getPublisher());
+        reference.setReferenceType(referenceDto.getReferenceType());
+        return reference;
+    }
 
     @Transactional
     public Integer update(PaperDto paperDto) throws IOException {