Lindgran, Henry Clay
John Wiley & Sons, 1966
Buku Teks
Combs, Arthur W.
Harper & Row, Publishers., 1959
Buku Teks
Powell, Russell A., 1950-
Wadsworth and Cengage Learning, 2013
Buku Teks
Powell, Russell A., 1950-
Cengage Learning, 2017
Buku Teks
Staats, Arthur W.
Holt, Rinehart and Winston, 1964
Buku Teks