APA

Sills D. L., . (1968). International encyclopedia of the social sciences. New York: Macmillan.

Chicago

Sills David L, . 1968. International encyclopedia of the social sciences. New York: Macmillan.

Harvard

Sills D. L., . (1968). International encyclopedia of the social sciences. New York: Macmillan.

MLA

Sills David L, . International encyclopedia of the social sciences. New York: Macmillan. 1968.