Reference: Dart 1993

Dart, Sarah N. 1993. Phonetic Properties of O'odham Stop and Fricative Contrasts. International Journal of American Linguistics 59(1). 16–37.

@article{dart1993tohono,
  author  = {Dart, Sarah N.},
  journal = {International Journal of American Linguistics},
  number  = {1},
  pages   = {16–37},
  title   = {Phonetic Properties of O'odham Stop and Fricative Contrasts},
  volume  = {59},
  year    = {1993}
}