The American Heritage dictionary of the English language/
edited by William Morris
- 4th Ed.
- Boston: Houghton Mifflin Company, 2006.
- 2074 p.
Regional patterns of American speech / Lee Pederson -- Variation and change in our living language / John R. Rickford -- Usage in The American heritage dictionary / Geoffrey Nunberg -- Indo-European and the Indo-Europeans / Calvert Watkins -- Proto-Semitic language and culture / John Huehnergard.