Hoskins, Janet, author
Routledge, 1998
Buku Teks
Barrett, John, author
Allen & Unwin, 1995
Buku Teks
Zelicoff, Alan P., author
American Management Association;, 2008
eBooks
McDermid, Val, author
Grove Press , 2014
Buku Teks
Rose, Frank, author
W. W. Norton & Company, 2011
Buku Teks