1. CONSER definition of a periodical, http://www.itsmarc.com/crs/manl1706.htm.
2. Selection criteria were described in more detail by Bill Katz inMagazine Selection: How to Build a Community-Oriented Collection(New York, NY : R.R. Bowker, 1971).
3. Katz. “Magazine Madness” p. 46.