Reference: Maddieson and Coupé 2015

Maddieson, Ian & Christophe Coupé. 2015. Human spoken language diversity and the acoustic adaptation hypothesis. The Journal of the Acoustical Society of America 138(3). 1838–1838. Acoustical Society of America.

@article{maddieson2015human,
  author    = {Maddieson, Ian and Coupé, Christophe},
  journal   = {The Journal of the Acoustical Society of America},
  number    = {3},
  pages     = {1838–1838},
  publisher = {Acoustical Society of America},
  title     = {Human spoken language diversity and the acoustic adaptation hypothesis},
  volume    = {138},
  year      = {2015}
}