- Author: Robert W. Young William Morgan
- Language: English
- Year: 1991
- Author: Robert W. Young William Morgan
- Language: English
- Year: 1987
- Author: Robert W. Young William Morgan
- Language: English, Navajo
- Year: 1951
- Author: Robert W. Young William Morgan
- Language: English, Navajo
- Year: 1994
- Author: Robert W. Young William Morgan
- Language: English, Navajo
- Year: 1972