Is there life on other worlds? /
Anderson, Poul,1926-2001.
New York : Collier Books ; London : Collier-Macmillan,
1968.
Originally published : New York : Crowell-Collier : 1963 ; (B63-17231), London : Collier-Macmillan : 1963.
Includes bibliography (p. 207-209) and index.