^ a b cCampbell, Philip J. (1989). Some Aspects of Pitu Ulunna Salu Grammar: A Typological Approach (MA thesis). University of Texas at Arlington.
^Friberg, Timothy; Laskowske, Thomas V. (1989). "South Sulawesi languages" (PDF). In J.N. Sneddon (ed.). Studies in Sulawesi linguistics part 1. NUSA 17. Jakarta: Badan Penyelenggara Seri Nusa. pp. 1–17.
^ a bCampbell, Philip J. (1991). "Phonology of Pitu Ulunna Salu" (PDF). In Rene van den Berg (ed.). Workpapers in Indonesian Languages and Cultures (PDF). Vol. 12, Sulawesi phonologies. Ujung Pandang, Sulawesi: Summer Institute of Linguistics. pp. 1–52. ISBN979-8132-85-8.
Further reading
Smith, Beverly Kean (1993). A Phonological Reconstruction of Proto-Pitu Ulunna Salu (MA thesis). University of Texas at Arlington.