1. Letter from Joshua Lederberg to Luca Cavalli-Sforza Publication: Produced: 11 May 1981 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Luca Cavalli-Sforza Publication: Produced: 15 October 1986 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)