Sims, David, author
Sage, 1993
Buku Teks
Ginzberg, Eli, 1911-, author
Columbia Univesity Press, 1957
Buku Teks
Bell, Gerard D., author
Prentice-Hall, 1967
Buku Teks
Gibson, James L., author
McGraw-Hill, 2000
Buku Teks
Greenberg, Jerald, author
Pearson, Prentice Hall, 2008
Buku Teks