A causative may be indicated by a:
(English)
Faust, Norma. 1973.Lecciones para el aprendizaje del idioma Shipibo-Conibo. Lima, Peru: Summer Institute of Linguistics.
Elson, Benjamin F., and Velma B. Pickett. 1988.Beginning morphology and syntax. Dallas, TX: Summer Institute of Linguistics.
Crystal, David. 1985.A dictionary of linguistics and phonetics. 2nd edition. New York: Basil Blackwell.