APA (7th ed.) Citation

Bretnor, R. (1989). Orion's sword. Baen Books.

Chicago Style (17th ed.) Citation

Bretnor, Reginald. Orion's Sword. New York, N.Y.: Baen Books, 1989.

MLA (9th ed.) Citation

Bretnor, Reginald. Orion's Sword. Baen Books, 1989.

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