Orilia, Lawrence S., author
McGraw-Hill, 1982
Buku Teks
Slotnick, Daniel L., author
D.C. Health, 1986
Buku Teks
Inmon, W.H., author
Prentice-Hall, 1983
Buku Teks
Elsevier Scientific Publishing, 1971
Buku Referensi
Clifton, H.D.
Auerbach, 1971
Buku Teks