Sullivan, Michael, author
[American Management Association, ], 2009
eBooks
Smith, Brenda D., author
Longman, 2000
Buku Teks
Schwartz, Lynne Sharon, author
Beacon Press, 1996
Buku Teks
American Library Association, 1970
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Boog, Jason, author
NY : A Touchstone Book, Published by Simon & Schuster, 2014
Buku Teks