Sackheim, George I., author
Pearson education , 2002
Buku Teks
Harrison, Paul, author
John Wiley & Sons, 2001
Buku Teks
Johnson, Kenneth D., author
The Benjamin, 1984
Buku Teks
Ackley, Meredith E., author
Appleton-Sentury Crofts, 1965
Buku Teks
Bauer, Richard C., author
McGraw-Hill, 2013
Buku Teks