Pergamon Press , 1975
Buku Teks
Christman, Luther P., author
Westview Press, 1981
Buku Teks
Ketterer, Richard F.
Sage, 1981
Buku Teks
MacStravic, Robin E. Scott
Aspen Systems Corp., 1977
Buku Teks
James A. Johnson, Carleen H. Stoskopf
Jones and Bartlett Publishers, 2010
Buku Teks