สืบค้น : การศึกษานอกระบบ

https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%A8%E0%B8%B6%E0%B8%81%E0%B8%A9%E0%B8%B2%E0%B8%99%E0%B8%AD%E0%B8%81%E0%B8%A3%E0%B8%B0%E0%B8%9A%E0%B8%9A
http://mediathailand.blogspot.com/2012/05/blog-post_2584.html
https://panchalee.wordpress.com/2010/12/28/non-formal/
http://lib.edu.chula.ac.th/FILEROOM/CABCU_PAMPHELT/DRAWER01/GENERAL/DATA0000/00000469.PDF
http://203.159.251.144/pattana/download/g.1/28..pdf