Stewart, Elbert W.
Tata McGraw-Hill, 1981
Buku Teks
Cohen, Bruce J., author
McGraw-Hill, 1988
Buku Teks
Schrag, Clarence C., author
Harper & Row, 1963
Buku Teks
Zanden, James W. Vander, author
John Wiley & Sons, 1979
Buku Teks
Ogburn, William F., author
Houghton Mifflin, 1946
Buku Teks