Ash, L. (1961). Subject collections: A guide to special book collections and subject emphases as reported by university, college, public, and special libraries and museums in the United States and Canada (2nd ed., revised and enlarged.). New York: R. R. Bowker.
Παραπομπή Chicago StyleAsh, Lee. Subject Collections: A Guide to Special Book Collections and Subject Emphases As Reported By University, College, Public, and Special Libraries and Museums in the United States and Canada. 2nd ed., revised and enlarged. New York: R. R. Bowker, 1961.
Παραπομπή MLAAsh, Lee. Subject Collections: A Guide to Special Book Collections and Subject Emphases As Reported By University, College, Public, and Special Libraries and Museums in the United States and Canada. 2nd ed., revised and enlarged. New York: R. R. Bowker, 1961.