“The Vocabulary of Colloquial Navajo, published in 1950 as a supplement to the Navajo Language, did include a wealth of sentence examples for each verb entry, and it was the intention of the authors that the two lexical works might sometime be combined and expanded—an intention that did not become possible until 1974 [(at UNM)] when a supporting grant was made for this purpose by the National Endowment for the Humanities.” (Young and Morgan 1987)
- Young, Robert W. and William Morgan, Sr. (1951) A Vocabulary of Colloquial Navajo. Phoenix: Bureau of Indian Affairs.
- Young, Robert W. and William Morgan, Sr. (1954) Navajo Historical Selections. Phoenix: Bureau of Indian Affairs.