Evaluation of reference services / edited by Bill Katz and Ruth A. Fraley
Haworth Press, 1984
 Buku Referensi
Personnel issues in reference service/edited by Bill Katz and Ruth A. Fraley
New York The Haworth Press 1986,
 Buku Referensi
Opportunities for reference services : the bright side of reference services in the 1990's / edited by Bill Katz
Haworth Press, 1991
 Buku Referensi
Coffman, Steve
Going live: starting and running a virtual reference service
[American Library association, American Library association], 2003
 eBooks
Kern, M. Kathleen
Virtual reference best practices: tailoring services to your library
[American Management Association, ], 2009
 eBooks