diff --git a/pl/cross/methodologies/refactoring/books.txt b/pl/cross/methodologies/refactoring/books.txt
index e4ba36657..fbb9a2c84 100644
--- a/pl/cross/methodologies/refactoring/books.txt
+++ b/pl/cross/methodologies/refactoring/books.txt
@@ -1,6 +1,9 @@
 2023
 Clausen - Five Lines of Code ru
     BA6EBA363E1CD49BD4D8D89C81D96B09
+Violetta - Refactoring in Java
+    https://libgen.gs/edition.php?id=149897084
+    https://libgen.gs/edition.php?id=150894734
 2020
 Lemaire - Refactoring at Scale
     4CDBF581079BF796FD0F3C777E3B94DF