- Author: Gary B Shelly, Corinne Hoisington, Course Technology Inc
- Language: English
- Year: 2011
- Author: John Walkenbach
- Language: English
- Year: 2013
- Author: Robert Martin
- Language: English
- Year: 2012
- Author: John Walkenbach
- Language: English
- Year: 2010
- Author: Andrew Couch
- Language: English
- Year: 2011
- Author: Bill Jelen
- Language: English
- Year: 2010
- Author: Кен Гетц Майк Гилберт
- Language: Русский
- Year: 2001
- Author: Л. Д. Слепцова
- Language: Русский
- Year: 2010
- Author: Keith Darlington
- Language: English
- Year: 2005
