Lee, Phil, author
Sage, 1980
Buku Teks
Schneider, Jo Anne, author
Columbia University Press, 2006
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1986
Buku Teks
Gilbert, Neil, author
Allyn and Bacon, 1998
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1974
Buku Teks