Thie, Paul R., author
John Wiley & Sons, 1979
Buku Teks
Ignizio, James P., author
Sage, 1985
Buku Teks
Feiring, Bruce R., author
Sage University Paper, 1986
Buku Teks
Swanson, Leonard W., author
Mc Graw Hill, 1980
Buku Teks
Kaplan, Edward L., author
John Wiley & Sons, 1982
Buku Teks