compiled by David R. Hampton
Prentince-Hall of India, 1979
Buku Teks
Certo, Samuel C.
Allyn and Bacon, 1989
Buku Teks
This, Leslie E.
Adison Wesley Publishing, 1974
Buku Teks
Wiest, Jerome D., author
Prentice-Hall, 1977
Buku Teks
Leahy, Emmett J.,
McGraw-Hill, 1965
Buku Teks