Ash, L. (1974). 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 (4th ed., rev. & enl.). Bowker.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Ash, 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. 4th ed., rev. & enl. New York: Bowker, 1974.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Ash, 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. 4th ed., rev. & enl. Bowker, 1974.
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