Gallagher, James D.
American Management Association, 1961
Buku Teks
Boulden, James B., author
McGraw-Hill, 1975
Buku Teks
Van Tassel, Dennis, author
Prentice-Hall, 1972
Buku Teks
Inmon, W.H., author
Prentice-Hall, 1983
Buku Teks
Fried, Louis, author
Reston Publishing, 1979
Buku Teks