APA (7th ed.) Citation

Simak, C. D. (1951). Time and again. Simon and Schuster.

Chicago Style (17th ed.) Citation

Simak, Clifford D. Time and Again. New York: Simon and Schuster, 1951.

MLA (9th ed.) Citation

Simak, Clifford D. Time and Again. Simon and Schuster, 1951.