http://www.sil.org/pacific/png/pubs/0000107/Waffa%20%5BWAJ%5D%20Syntax_Verbs%20and%20Verb%20Phrases_1969.pdf (Publisher version)
Stringer, M., & Hotz, J. (Eds.). (1969). Waffa syntax - verbs and verb phrases (N.A.). Ukarumpa: Summer Inst. of Linguistics.