tài liệu cơ khí

http://www.cadviet.com/forum/topic/62182-nhung-cuon-sach-hay-cho-dan-co-khi/
https://www.tinhte.vn/threads/link-download-hon-300-ebook-ky-thuat-co-khi.2297680/
https://www.facebook.com/tailieucokhi
https://sites.google.com/site/relaxtolearn/tai-lieu-lop-cdh12o/tong-hop-sach-co-khi
http://www.tailieubachkhoa.vn/tong-hop-tai-lieu-giao-trinh-ky-thuat-nhieu-chuyen-nganh--1305.aspx