APA (7th ed.) Citation

Anderson, P., & Bretnor, R. (1988). The spear of Mars. Baen Publishing.

Chicago Style (17th ed.) Citation

Anderson, Poul, and Reginald Bretnor. The Spear of Mars. New York: Baen Publishing, 1988.

MLA (9th ed.) Citation

Anderson, Poul, and Reginald Bretnor. The Spear of Mars. Baen Publishing, 1988.

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