APA (7th ed.) Citation

Anderson, P. (1962). Guardians of time. Science Fiction Book Club.

Chicago Style (17th ed.) Citation

Anderson, Poul. Guardians of Time. London: Science Fiction Book Club, 1962.

MLA (9th ed.) Citation

Anderson, Poul. Guardians of Time. Science Fiction Book Club, 1962.

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