Notes and References
- Roddenberry, Gene (Executive Producer). "Charlie X." Star Trek, Season 1, Episode 7. Directed by Lawrence Dobkin. Story by Gene Roddenberry. Teleplay by D.C. Fontana. Desilu Productions, 15 September 1966.
- Scheimer, Lou & Prescott, Norm (Producers). "More Tribbles, More Troubles." Star Trek: The Animated Series, Episode 1. Directed by Hal Sutherland. Written by David Gerrold. Filmation Associates, 6 October 1973.
- Okuda, Michael and Okuda, Denise. The Star Trek Encyclopedia, 2nd ed. Illustrations by Doug Drexler. Photo Editing by Margaret Clark. Research Consulting by Robert H. Justman, Greg Jein, and Bjo Trimble. Additional Research by Curt Danhauser and S.J. Casey Bernay. First Edition with Debbie Mirek. Pocket Books, December 1997.