Posnack, E. R. (1946). The 21st centrury looks back. New York: William-Frederick Press.
シカゴスタイル引用形Posnack, Emanuel R. The 21st Centrury Looks Back. New York: William-Frederick Press, 1946.
MLA引用形式Posnack, Emanuel R. The 21st Centrury Looks Back. New York: William-Frederick Press, 1946.
警告: この引用は必ずしも正確ではありません.