No authors listed.
Variety p. 52. March 5, 1969.
Variety p. 87. January 8, 1969.
Hirsch, David
Starlog 55: 52-54. February 1982.
Rogers, Tom
Starlog 5: 52-55. May 1977.
Barnes, John A.
National Review [1 p.] December 21, 2004. (Cited from the LEXISNEXIS version.)
Konig, Howard T.; Snauffer, Douglas
Starlog 232: 34-37. November 1996.
Goldberg, Lee
Starlog 71: 20-21. June 1983.
Variety p. 39. February 16, 1972.
Hutchings, Peter
in: Hochscherf, Tobias; Leggott, James, eds. British Science Fiction Film and Television: Critical Essays. Jefferson, N.C. : McFarland, 20111. p. 85-95
Garcia, Frank; Phillips, Mark
in: Phillips, Mark and Garcia, Frank. Science Fiction and Television Series: Episode Guides, Histories, and Cast and Credits for 62 Prime Time Shows, 1959-1989. Jefferson, NC: McFarland, 1996. pp. 513-520.
Variety p. 38. June 28, 1972.
Variety p. 39. January 19, 1972.
Zimmerman, Howard
Starlog 5: 48-51. May 1977.
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