- Author: Roy V. Ferguson, Alan Pence, Carey Denholm
- Language: English
- Year: 1992
- Author: Abbie Gordon Klein
- Language: English
- Year: 1992
- Author: Gerasimo Luisa, Paradis Adrian A
- Language: English
- Year: 2003
- Author: National Research Council
- Language: English
- Year: 1990