Here is an interesting piece about Rigor in the IB Psychology program. http://togalearning.com/2011/10/11/rigor-redefined-in-ib-psychology/

An easy to follow introduction for those interested in child development.
http://www.behavioradvisor.com/PlayTherapy.html

http://www.apa.org/pi/oema/resources/american-indian.aspx

This site has wonderful articles and studies pertaining to indigenous populations and cross-cultural practice.