The polar worlds.
Illustrated by Nancy Lou Gahan.
APA Citation
Perry, R. (1973). The polar worlds. [1st ed.] New York: Taplinger.
MLA Citation
Perry, Richard, 1909-. The Polar Worlds. [1st ed.] New York: Taplinger, 1973.
Warning: These citations may not always be complete (especially for serials).