Cashmore, Carol, author
Prentice-Hall, 1991
Buku Teks
O`Brien, James A., 1936-, author
McGraw-Hill, 2003
Buku Teks
McLeod, Raymond, author
John Wiley & Sons, 1982
Buku Teks
O`Brien, James A., 1936-, author
McGraw-Hill/Irwin, 2004
Buku Teks
Forkner, Irvine, author
John Wiley & Sons, 1973
Buku Teks