J. A. Z'graggen

• A comparative word list of the Mabuso languages, Madang Province, Papua New Guinea
• A comparative word list of the Northern Adelbert Range languages, Madang Province, Papua New Guinea
• A comparative word list of the Rai Coast languages, Madang Province, Papua New Guinea
• A comparative word list of the Southern Adelbert Range languages, Madang Province, Papua New Guinea
• Classificatory and typological studies in languages of the Madang District
• The languages of the Madang District, Papua New Guinea
• And thus became God