- Author: James H. Svara, Kimberly Nelson, Douglas J. Watson, J. Edwin Benton, Donald C. Menzel, Darryl Paulson, Wendy L. Hassett, Nelson Wikstrom, Glen W. Sparrow, Megan Mullin
- Language: English
- Year: 2010
- Author: Douglas J. Watson, Wendy L. Hassett
- Language: English
- Year: 2003
- Author: Douglas J. Watson
- Language: English
- Year: 1997