Ferguson, John H.
McGraw-Hill, 1981
Buku Teks
Schroeder, Richard C.
Kantor Program Informasi Internasional Departemen Luar Negeri Amerika Serikat, [date of publication not identified]
Buku Teks
Wilson, James Q.
D.C. Heath, 1995
Buku Teks
Starling, Grover
The Dorsey Press, 1982
Buku Teks
Wilson, James Q.
D.C. Helath and Co., 1986
Buku Teks