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Susanne Holzknecht (1989). The Markham Languages of Papua New Guinea. Pacific Linguistics. ISBN0-85883-394-8.
Wurm, S.A. editor. Some Endangered Languages of Papua New Guinea: Kaki Ae, Musom, and Aribwatsa. D-89, vi + 183 pages. Pacific Linguistics, The Australian National University, 1997.