REFERENSI BELAJAR DARI INTEERNET

-Belajar AutoCAD
http://tentangcad.com
http://mocksiper.blogspot.com/2011/05/autocad_12.html
 
-belajar Mechanical
http://onnyapriyahanda.com/

-belajar steel
http://www.steelindonesia.com/

-ikpt
http://www.ikpt.com/career.html