Weinbach, Robert W., author
Pearson, 2015
Buku Teks
Powell, Suzanne K., author
Lippincott , 2000
Buku Teks
Ruffa, Stephen A., 1961- , author
American Management Association, 2011
eBooks
Denning, Melita
Llewellyn Publications, 1993
Buku Teks
Quirk, Thomas J., author
Springer, 2012
eBooks