APA (7th ed.) Citation

Smith, C. C. (1981). Twentieth century science fiction writers. St. Martin's Press.

Chicago Style (17th ed.) Citation

Smith, Curtis C. Twentieth Century Science Fiction Writers. New York: St. Martin's Press, 1981.

MLA (9th ed.) Citation

Smith, Curtis C. Twentieth Century Science Fiction Writers. St. Martin's Press, 1981.