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1af Eckermann, W. (William)Fag “...Bukawa language Papua New Guinea Morobe Province Grammar....”
Udgivet 2007
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2af McElhanon, K. A. (Kenneth A.)“...Morobe Province (Papua New Guinea) Languages....”
Udgivet 1984
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3“...Morobe Province (Papua New Guinea) Languages....”
Thesis Bog