- Author: William Labov, Sharon Ash, Charles Boberg
- Language: English
- Year: 2005
- Author: William Labov Sharon Ash Charles Boberg
- Language: English
- Year: 2006
- Author: William Labov Sharon Ash Charles Boberg
- Language: English
- Year: 2005
- Author: Charles Boberg
- Language: English
- Year: 2010
- Author: Charles Boberg
- Language: English
- Year: 2010