Farrell, Warren
[American Management Association, ], 2005
eBooks
Legato, Marianne J
Gramedia Pustaka Utama, 2006
Buku Teks SO
Hollander, Dory
Harper Prennial, 1995
Buku Teks SO
Mazo, Ellen
Rodale, 2002
Buku Teks SO
Sandel, Michael J.
Farrar, Staus and Giroux, 2010
Buku Teks SO