APA (7th ed.) Citation

Van Vogt, A. E. (1972). The pawns of Null-a. Sphere.

Chicago Style (17th ed.) Citation

Van Vogt, A. E. The Pawns of Null-a. London: Sphere, 1972.

MLA (8th ed.) Citation

Van Vogt, A. E. The Pawns of Null-a. Sphere, 1972.

Warning: These citations may not always be 100% accurate.