APA (7th ed.) Citation

Simak, C. D. (1968). Why call them back from heaven. The Science Fiction Book Club, by arrangement with V. Gollancz.

Chicago Style (17th ed.) Citation

Simak, Clifford D. Why Call Them Back from Heaven. London: The Science Fiction Book Club, by arrangement with V. Gollancz, 1968.

MLA (9th ed.) Citation

Simak, Clifford D. Why Call Them Back from Heaven. The Science Fiction Book Club, by arrangement with V. Gollancz, 1968.