The Numugen (Numagen) languages are a small family of closely related languages in the Madang branch of the Trans–New Guinea languages (TNG) phylum of New Guinea, spoken in the region of the Numagen River.
Ross, Malcolm (2005). "Pronouns as a preliminary diagnostic for grouping Papuan languages". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson (eds.). Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. pp. 15–66. ISBN0858835622. OCLC67292782.