Hildebrand, Verna, author
1997
Buku Teks
American Library Association,
Majalah, Jurnal, Buletin
edited by Margaret Brittin
Routledge , 1992
Buku Teks
edited by David Baker and Wendy Evans
Emerald, 2017
eBooks
Bolles, Dennis, author
[American Management Association, ], 2002
eBooks