Miller, Alden D.
Sage, 1985
Buku Teks
Alarid, Leanne Fiftal, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Pine Forge Press, 1996
Buku Teks
Sellin, Thorsten, author
Wiley Eastern Private Limited, 1970
Buku Teks
Street, David
The Free Press, 1966
Buku Teks