APA Citatie

Posnack, E. R. (1946). The 21st centrury looks back. New York: William-Frederick Press.

Chicago Style citaat

Posnack, Emanuel R. The 21st Centrury Looks Back. New York: William-Frederick Press, 1946.

MLA citatie

Posnack, Emanuel R. The 21st Centrury Looks Back. New York: William-Frederick Press, 1946.

Let op: Deze citaties zijn niet altijd 100% accuraat.