Houghteling, James L., author
Harcourt, Brace & Word, 1968
Buku Teks
Arrigo, Bruce A., author
San diego, 2003
Buku Teks
Altschuler, Bruce E., author
Prentice-Hall, 1996
Buku Teks
Klein, Mitchell S.G., author
Prentice-Hall, 1984
Buku Teks
BPS Blackwell, 2012
Buku Teks