1. SETI: The Search for Extraterrestrial Intelligence, NASA SP419, 1977;
2. SETI Science Working Group Report; Editor Frank Drake, 1983;
3. Proceedings of the 112th IAU Symposium, University of Boston, 18–21 June 1984 (unpublished);
4. NASA, JPL Document No. 1720–4100, 10 September 1990.
5. SHARP: LH9124 Application Note, 1993.