- Author: Allen Phillip E., Holberg Douglas R
- Language: English
- Year: 2011
- Author: P E Allen, Douglas R Holberg
- Language: English
- Year: 2002
- Author: Phillip E. Allen Douglas R. Holberg Allen
- Language: English
- Author: Allen P.E. Holberg D.R.
- Language: English
- Year: 2002