Rayman, John
Kogan Page, 1983
Buku Teks
Stockton B. Colt, editor
[American Management Association, ], 1998
eBooks
Baldwin, David A. (David Allen), author
Libraries Unlimited, 2003
Buku Referensi
Milkovich, George T., author
McGraw-Hill , 2008
Buku Teks
Milkovich, George T., author
McGraw-Hill, 2011
Buku Teks