Davison, Gerald C., author
John Wiley & Sons, 2004
Buku Teks
Nevid, Jeffrey S.
Pearson Education International, 2008
Buku Teks
Butcher, James N., author
Pearson, 2008
Buku Teks
Barlow, David H., author
Brooks/Cole, 1995
Buku Teks
Barlow, David H., author
Thomson , 2005
Buku Teks