
- Author: Alan D Wolfelt, Alan D Wolfelt, Kirby J. Duvall
- Language: English
- Year: 2012

- Author: Alan D Wolfelt, Alan D Wolfelt, Kirby J. Duvall
- Language: English
- Year: 2012

- Author: Alan D Wolfelt, Alan D Wolfelt, Raelynn Maloney
- Language: English
- Year: 2011

- Author: Alan D Wolfelt, Alan D Wolfelt
- Language: English
- Year: 2002

- Author: Alan D Wolfelt, Alan D Wolfelt
- Language: English
- Year: 2013

- Author: Alan D. Wolfelt Alan D Wolfelt Kirby J. Duvall
- Language: English
- Year: 2010

- Author: Alan D. Wolfelt PhD
- Language: English
- Year: 2005

- Author: Alan D. Wolfelt PhD
- Language: English
- Year: 2001