diff --git a/02-data/intermediate/zotero-library.bib b/02-data/intermediate/zotero-library.bib
index 9fbed20..5bc0a0c 100644
--- a/02-data/intermediate/zotero-library.bib
+++ b/02-data/intermediate/zotero-library.bib
@@ -14930,7 +14930,7 @@ The authors suggest this is due to most of the cash grant diverted from the busi
   keywords = {cite::channels,country::Vietnam,inequality::education,inequality::ethnicity,inequality::migration,method::qualitative,out::abstract,region::AP,sample::database}
 }
 
-@article{Do2020,
+@article{Do2020a,
   ids = {WOS:000542060800052},
   title = {Impact of Vocational Training on Wages of Ethnic Minority Labors in {{Vietnam}}},
   author = {Do, Ha Thi Hai and Mai, Cuong Ngoc and Mai, Anh Ngoc and Nguyen, Nui Dang and Pham, Toan Ngoc and Le, Huong Thi Thu and Tran, Manh Dung and Vu, Tri Tuan},