Kline, John M., author
Quorum Books, 1985
Buku Teks
Ziegler, Raymond J.
Appleton-Century-Crofts, 1966
Buku Teks
Feld, Werner J., author
Pergamon Press, 1980
Buku Teks
Ebb, Lawrence F.
West Publishing Company, 1964
Buku Teks
Ebb, Lawrence F., author
West Publishing, 1964
Buku Teks
Kolde, Endel J.
Prentice-Hall, 1968
Buku Teks