Pease, Allan, author
Ufuk Press, 2006
Buku Teks
Farrell, Warren, author
[American Management Association, ], 2005
eBooks
Legato, Marianne J, author
Gramedia Pustaka Utama, 2006
Buku Teks
Hollander, Dory, author
Harper Prennial, 1995
Buku Teks
Mazo, Ellen, author
Rodale, 2002
Buku Teks