Miller, W. G., Scott, B., Vickery, K., McDonough, B., & Ash, L. (1993). 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 (7th ed., rev. and enl.). New Providence, NJ: R.R. Bowker Co..

Miller, William G., Barry Scott, Kathleen Vickery, Beverly McDonough, and Lee Ash. 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. 7th ed., rev. and enl. New Providence, NJ: R.R. Bowker Co., 1993.

Miller, William G., et al. 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. 7th ed., rev. and enl. New Providence, NJ: R.R. Bowker Co., 1993.