Schoner, Bernd, author
McGraw-Hill Education, 2014
Buku Teks
Bradberry, John, 1961-, author
American Management Association, 2011
eBooks
Keller, Gary, author
McGraw-Hill, 2010
Buku Teks
Stern, David, author
Chandos, 2013
eBooks
Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi