- Author: Dennis G. Zill Warren S. Wright
- Language: English
- Year: 2011
- Author: Dennis G.(Dennis G. Zill) Zill
- Language: English
- Year: 2008
- Author: Dennis G. Zill Warren S. Wright
- Language: English
- Year: 2012
- Author: Dennis G. Zill Michael R. Cullen
- Language: English
- Year: 2008
- Author: Dennis G. Zill
- Language: English
- Year: 2012
- Author: Dennis G. Zill Warren S Wright
- Language: English
- Year: 2012
- Author: Dennis G. Zill
- Language: English
- Year: 2008