Campbell and Campbell 1987

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 (Unpublished Manuscript).

@unpublished{sinnemakizeromarking-Campbell1987,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  note      = {Unpublished Manuscript},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}
}