Não informado. (1966). Investigaciones educativas en america. Pan American Union, Department of Educational Affairs.
Chicago-referens (17:e uppl.)Não informado. Investigaciones Educativas En America. Washington: Pan American Union, Department of Educational Affairs, 1966.
MLA-referens (8:e uppl.)Não informado. Investigaciones Educativas En America. Pan American Union, Department of Educational Affairs, 1966.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.