- Author: John C. Shovic Alan Simpson
- Language: English
- Year: 2021
- Author: John C. Shovic Alan Simpson
- Language: English
- Year: 2021
- Author: John Shovic Alan Simpson
- Language: English
- Year: 2021
- Author: Warner Timothy L., Weverka Peter, Alan Simpson
- Language: English
- Year: 2019
- Author: John Shovic Alan Simpson
- Language: English
- Year: 2019
- Author: Alan Simpson
- Language: English
- Year: 2004
- Author: Alan Simpson
- Language: Greek
- Author: Alan Simpson Margaret Levine Young Alison Barrows April Wells Jim McCarter
- Language: English
- Year: 2006
- Author: Alan Simpson, Todd Meister
- Language: English
- Year: 2007