Gaya APA

Sills, D, L., Swanson, C, P. (1968). International encyclopedia of the social sciences volume 13 . New York: New York: The Macmillan Co. & The Free Press; 1968.

Gaya MLA

Sills, David, L.., Swanson, Carl, P.. "International encyclopedia of the social sciences volume 13". New York: New York: The Macmillan Co. & The Free Press; 1968, 1968. Text.