Ash, L. (1958). Subject collections: A guide to special book collections and subject emphases as reported by university, college, public and special libraries in the United States, the Territories, and Canada. Bowker.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAsh, Lee. Subject Collections: A Guide to Special Book Collections and Subject Emphases as Reported by University, College, Public and Special Libraries in the United States, the Territories, and Canada. New York: Bowker, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAsh, Lee. Subject Collections: A Guide to Special Book Collections and Subject Emphases as Reported by University, College, Public and Special Libraries in the United States, the Territories, and Canada. Bowker, 1958.
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