Não informado. (1966). Investigaciones educativas en america. Pan American Union, Department of Educational Affairs.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Investigaciones Educativas En America. Washington: Pan American Union, Department of Educational Affairs, 1966.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Investigaciones Educativas En America. Pan American Union, Department of Educational Affairs, 1966.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.