Campbell, Carl and Campbell, Judy. 1987. Yade Grammar Essentials. Ukarumpa: Summer Institute of Linguistics. (Unpublished Manuscript).
@unpublished{sinnemakizeromarking-Campbell1987, address = {Ukarumpa}, author = {Campbell, Carl and Campbell, Judy}, note = {Unpublished Manuscript}, publisher = {Summer Institute of Linguistics}, title = {Yade Grammar Essentials}, year = {1987} }