Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig (eds.). Ethnologue report for language code: cua. Ethnologue: Languages of the World, Fifteenth edition. Dallas, Tex.: SIL International. 2014. (原始内容存档于2019-06-29).
Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig (eds.). Ethnologue report for language code: cua. Ethnologue: Languages of the World, Fifteenth edition. Dallas, Tex.: SIL International. 2014. (原始内容存档于2019-06-29).