Anderson, Poul. "How to Build a Planet." In Turning Points: Essays on the Art of Science Fiction. Edited by Damon Knight. New York: Harper and Row, 1977. Anderson explains how to create believable planets for science fiction.

——. "Science Fiction and History."

Amazing Stories 63 (January 1989): 4349. Anderson here discusses how the past may be used to suggest possible futures.

Beetz, Kirk H. "Poul Anderson." In Beacham's Popular Fiction in America. Edited by Walton Beacham and Suzanne Niemeyer. Washington, DC: Beacham Publishing, 1986. Vol 1: 2735. Discusses Anderson's career, his books Trader to the Stars and The Avatar, and his novelette "The Queen of Air and Darkness."

Clute, John. "Anderson, Poul." In The Science Fiction Encyclopedia. Edited by Peter Nicholls, et al. Garden City, NY: Dolphin Books (Doubleday), 1979: 31-32. Summarizes Anderson's career, and discusses his publications and how they figure in his development as an author. No great insights...