1. Andrew D. Osborn, Serial Publications: Their Place and Treatment in Libraries 2d ed. (Chicago: American Library Association, 1973), 20rev.
2. David A. Kronick, A History of Scientific and Technical Periodicals 2d ed. (Metuchen, NJ: Scarecrow Press, 1976), 54.
3. Hellmut Lehmann-Haupt, Gutenberg and the Master of the Playing Cards (New Haven: Yale University Press, 1966), 47.