1. Anderson, Stephen. 1992. A-morphous morphology. Cambridge: Cambridge University Press.
2. Austin, Peter. 1981. A grammar of Diyari, South Australia. Cambridge: Cambridge University Press.
3. Bach, Emmon. 1981. On time, tense, and aspect: An essay in English metaphysics. In Radical pragmatics, ed. Peter Cole, 63–81. New York: Academic Press.
4. Baker, Mark. 2008. The syntax of agreement and concord. Cambridge: Cambridge University Press.
5. Bjorkman, Bronwyn. 2011. Be-ing default: The morphosyntax of auxiliaries, PhD diss., MIT, Cambridge, Mass.