edited by David A. Turner
Addison-Wesley, 1990
Buku Teks
Beach, David P.
Prentice-Hall, 1992
Buku Referensi
Girden, Ellen R.
Sage, 2001
Buku Teks
edited by Tracey Epps, Michael J. Trebilcock
UK Edward Elgar, 2013
Buku Teks
Sidman, Murray
Basic Books, 1960
Buku Teks