Public Libraries Group of the Library Association, 1987,
Buku Referensi
Bruington, Pat, author
Charles E. Merrill, 1984
Buku Teks
Bear, Mariah, author
McGraw-Hill , 2000
Buku Teks
Harvey, Thomas R.
Allyn and Bacon, 1990
Buku Teks
Sannwald, William W., author
[American Management Association;, ], 2009
eBooks