Young, Philip D. and Givón T. 1990. "The Puzzle of Ngóbére Auxiliaries: Grammatical Reconstruction in Chibchan and Misumalpan." In Studies in typology and diachrony for Joseph H. Greenberg, edited by William et al. Croft. 209-243. Benjamins.
Marlett, Stephen A. 1984. "Switch-reference and Subject Raising in Sero." In The syntax of Native American languages, edited by Eung-Do Cook and Donna B. Gerdts. 247-268. Academic Press.
Levine, Robert D. 1984. "Empty Categories, Rules of Grammar, and Kwakwala Complementation." In The syntax of Native American languages, edited by Eung-Do Cook and Donna B. Gerdts. 215-245. Academic Press.
Jung, Dagmar. 2002. "Clause Combining in Apache." In Problems of Polysynthesis, edited by Nicholas Evans and Hans-Jürgen Sasse. 167-183. Akademie.
Gorbet, Larry. 1998. "Subjectivity and Variation in Desiderative Constructions of Diegueño and Cocopa." In Studies in American Indian languages: description and theory, edited by Leanne Hinton and Pamela Munro. 10-15. University of California Press.