http://www.sil.org/pacific/png/pubs/0000106/Waffa%20%5BWAJ%5D_Syntax_Clauses_1971.pdf (Publisher version)
Stringer, M., & Hotz, J. (Eds.). (1971). Waffa syntax - clauses: (grammar) (N.A.). Ukarumpa: Summer Inst. of Linguistics.