Bester, Alfred. "Robert Heinlein." Publishers Weekly (July 2, 1973): 44-45.

One of the best interviews with the author.

Franklin, H. Bruce. Robert A. Heinlein: America as Science Faction. New York: Oxford University Press, 1980. A comprehensive review of Heinlein's career and works.

Knight, Damon. "One Sane Man: Robert Heinlein." In Search of Wonder. Rev.

Olander, Joseph D., and Martin H. Greenberg, eds. Robert A. Heinlein.

New York: Taplinger, 1977. A collection of interesting and varied essays on the major themes and qualities of Heinlein's work.

Panshin, Alexei. Heinlein in Dimension.

Chicago: Advent, 1968. A subjective analysis of the major themes in Hein lein. The first detailed study, this work has influenced other critics.

Samuelson, David N. "The Frontier Worlds of Robert A. Heinlein." In Voices for the Future, vol. 1, edited by Thomas Clareson. Bowling Green, OH: Bowling...