American Library Association, 1970
Buku Teks
Schwartz, Lynne Sharon
Beacon Press, 1996
Buku Teks
Daniel, Robert S.
Hoghton Mifflin, 1965
Buku Teks
edited by Robert S. Daniel
Hougton Mifflin, 1965
Buku Teks
Sullivan, Michael
[American Management Association, ], 2009
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