Reference: Sands et al. 1996

Sands, Bonny, Ian Maddieson & Peter Ladefoged. 1996. The phonetic structures of Hadza. Studies in African linguistics 25(2). 171–204.

@article{sands1996hadza,
  author  = {Sands, Bonny and Maddieson, Ian and Ladefoged, Peter},
  journal = {Studies in African linguistics},
  number  = {2},
  pages   = {171–204},
  title   = {The phonetic structures of Hadza},
  volume  = {25},
  year    = {1996}
}