Cortada, James W., author
McGraw-Hill, 1993
Buku Teks
Johnson, Lewis K., author
Allyn and Bacon, 1957
Buku Teks
Bolt, Gordon, author
Crest publishing, 1999
Buku Referensi
Ho, Samuel K., author
Crest publishing, 1999
Buku Referensi
Linoff, Gordon S., author
Wiley publishing, 2011
Buku Teks