Ignizio, James P., author
Sage, 1985
Buku Teks
Feiring, Bruce R., author
Sage University Paper, 1986
Buku Teks
Thie, Paul R., author
John Wiley & Sons, 1979
Buku Teks
Campbell, Hugh G., author
Prentice-Hall, 1977
Buku Teks SO
Djati Kerami, author
Universitas Terbuka, 2008
Buku Teks