http://soportes-contables.iue.over-blog.es/pages/SOPORTES_DE_CONTABILIDAD-1310261.html

https://docs.google.com/a/teinco.edu.co/document/d/1xzAyMDlq64un_HDW_DzVEvwpt1en06fhcEM0Xda3P78/edit

http://www.contaduria.gov.co