Croteau, David, author
McGraw-Hill, 2013
Buku Teks
Hobbs, Donald A., author
John Wiley & Sons, 1982
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