Cita APA (7th ed.)

Laumer, K., & Silverberg, R. Science fiction special. Sidgwick and Jackson.

Cita Chicago (17th ed.)

Laumer, Keith, i Robert Silverberg. Science Fiction Special. London: Sidgwick and Jackson.

Cita MLA (8th ed.)

Laumer, Keith, i Robert Silverberg. Science Fiction Special. Sidgwick and Jackson.