- Author: Melvin Ember, Carol R. Ember
- Language: English
- Year: 2002
- Author: Melvin Ember, Carol R. Ember
- Language: English
- Year: 2002
- Author: Melvin Ember, Carol R. Ember
- Language: English
- Year: 2002
- Author: Melvin Ember, Carol R. Ember
- Language: English
- Year: 2002
- Author: Melvin Ember, Carol R Ember
- Language: English
- Year: 2001
- Author: Melvin Ember, Carol R Ember
- Language: English
- Year: 2001