BibTeX

@misc{ClarkandClark1987,
  author       = {Clark, Stephen and Clark, Dawn},
  howpublished = {Draft. Summer Institute of Linguistics, Ukarumpa.},
  title        = {Sio grammar essentials},
  url          = {https://www.sil.org/resources/archives/31124},
  year         = {1987},
  sections     = {None}
}