Johnson, Robert W., author
Allyn and Bacon, 1962
Buku Teks
Pinches, George E., author
HarperCollins, 1994
Buku Teks
Camp, L. Jean, author
Springer, 2012
eBooks
edited by Kevin Dowd and Mervyn K. Lewis
Macmillan, 1992
Buku Teks
Mishkin, Frederick S., author
Addison-Wesley, 1997
Buku Teks