Não informado. (1966). Investigaciones educativas en america. Pan American Union, Department of Educational Affairs.
Chicago-viite (17. p.)Não informado. Investigaciones Educativas En America. Washington: Pan American Union, Department of Educational Affairs, 1966.
MLA-viite (8. p.)Não informado. Investigaciones Educativas En America. Pan American Union, Department of Educational Affairs, 1966.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.