Vogel, Harold L., author
Cambridge University Press, 2007
Buku Teks
Helfert, Erich A., author
McGraw-Hill/Irwin, 2003
Buku Teks
Fairhurst, Danielle Stein, author
John Wiley & Sons, 2012
Buku Teks
Hilman, A. Douglas, author
Dryden Press , 1986
Buku Teks
Kochanek, Richard F., author
Harcourt Brace Jovanovich, 1990
Buku Teks