Changes in the Behavior of the Brazilian ‘BoP consumer

http://www.nextbillion.net/blogpost.aspx?blogid=2094 January 17, 2011

http://orangemilky.blogspot.com/2012/03/brazil-and-bop-consumer-behaviour-in.html?showComment=1338754439965#c8529730379626788964 (missing citations)

Socio-Economic Levels in Latin America
http://www.zonalatina.com/Zldata200.htm