1. Letter from Attallah Kappas to Joshua Lederberg Publication: Produced: 25 January 1982 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Attallah Kappas to Joshua Lederberg Publication: Produced: 12 May 1982 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)