Bass, Bernard M., author
Allyn and Bacon, 1973
Buku Teks
Landy, Frank J., author
Wiley, 2013
Buku Teks
Auerbach Alan J., author
Brown & Benchmark, 1996
Buku Teks
edited by P.J.D. Drenth ... [and others]
John Wiley & Sons, 1984
Buku Referensi
Riggio, Ronald E., author
Pearson, 2009
Buku Teks