Sorenson, Ritch, author
Prentice-Hall, 2001
Buku Referensi
Smith, Shawn, author
Amacom, 2011
Buku Teks
edited by Linn C. Stuckenbruck
Addison-Wesley, 1981
Buku Referensi
Sikich, Geary W., author
McGraw-Hill, 1996
Buku Referensi
edited by Alison Scammell
Aslib, 2001
Buku Referensi