Não informado. (1966). Investigaciones educativas en america. Pan American Union, Department of Educational Affairs.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Investigaciones Educativas En America. Washington: Pan American Union, Department of Educational Affairs, 1966.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Investigaciones Educativas En America. Pan American Union, Department of Educational Affairs, 1966.
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