APA引文

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

Παραπομπή Chicago Style

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

MLA引文

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

警告：這些引文格式不一定是100％准確.