Opportunities for reference services : the bright side of reference services in the 1990's / edited by Bill Katz
Haworth Press, 1991
 Buku Referensi
Evaluation of reference services / edited by Bill Katz and Ruth A. Fraley
Haworth Press, 1984
 Buku Referensi
Personnel issues in reference services / edited by Bill Katz and Ruth A. Fraley
Haworth Press, 1986
 Buku Referensi
Reference services in the humanities
edited by Judy Reynolds
Haworth Press, 1994
 Buku Referensi
Bopp, Richard E., author
Reference and information services : an introduction
Libraries Unlimited, 2001
 Buku Teks
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