Russett, Bruce, author
Wadsworth, 2010
Buku Teks
Arrow, Kenneth J., author
John Wiley & Sons, 1951
Buku Teks
Becker, William E., author
Prentice-Hall, 1971
Buku Teks
Dunphy, Dexter C., author
McGraw-Hill, 1985
Buku Teks
Mueller, Dennis C., author
Cambridge University Press, 2005
Buku Teks