Tài liệu tham khảo WikiPedia: Pác_Nặm //tools.wmflabs.org/geohack/geohack.php?language=v... https://commons.wikimedia.org/wiki/Category:Pac_Na... https://backan.gov.vn/DocumentLibrary/ed3ebde4d42f... https://pacnam.backan.gov.vn
