Dewey, Patrick R., author
Meckler Corporation, 1987
Buku Referensi
Weijermars, Ruud, author
Springer-Verlag, 2011
eBooks
Hasbrouck, Ellen K.
Jossey-Bass, 1996
Buku Teks
Dickinson, Peter Somers, author
W.S. Hein, 1989
Buku Teks
Fairhurst, Danielle Stein, author
John Wiley & Sons, 2012
Buku Teks