A qualitative analysis of the internal efficiency of formal distance education systems in Mexico
Internet
http://spectrum.library.concordia.ca/4633/1/NL49123.pdfPalavicini Esponda, Jaime Rodolfo <http://spectrum.library.concordia.ca/view/creators/Palavicini_Esponda=3AJaime_Rodolfo=3A=3A.html> (1986) A qualitative analysis of the internal efficiency of formal distance education systems in Mexico. PhD thesis, Concordia University.