BibTeX

@misc{Condra1989,
  author       = {Condra, Edwin C.},
  howpublished = {Unpublished manuscript, Summer Institute of Linguistics Papua New Guinea Branch},
  title        = {Patpatar grammar essentials},
  url          = {https://www.sil.org/resources/archives/43567},
  year         = {1989},
  sections     = {None}
}