1. Binnick, Robert (1991). Time and the Verb. New York: Oxford University Press.
2. Botne, Robert (1983). On the notion "inchoative verb" in Kinyarwanda. In F. Jouannet (ed.), Le kinyarwanda: Etudes linguistiques, 149-180. Paris: SELAF.
3. Burusphat, Somsonge (1991). The Structure of Thai Narrative. Dallas, Texas: SIL and University of Texas at Arlington.
4. Dillon, George L. (1977). Introduction to Contemporary Linguistic Semantics. Englewood Cliffs, N.J.: Prentice-Hall.
5. Toward a semantic analysis of verb aspect and the English ?imperfective? progressive