- Schauber, Ellen. 1975. Theoretical responses to Navajo questions.. (Doctoral dissertation, Massachusetts Institute of Technology).
- Young, Robert W. and William Morgan, Sr. 1987. The Navajo Language: a Grammar and Colloquial Dictionary. Albuquerque: University of New Mexico Press. Revision of Young and Morgan (1984).
- Young, Robert W., Morgan, William Sr. and Sally Midgette. 1992. Analytical Lexicon of Navajo. Albuquerque: University of New Mexico Press.
Click here for an introduction to Navajo conjunctions and related expressions.