Ladefoged et al. 1977

Ladefoged, Peter and Cochran, A. and Disner, S. F. 1977. Laterals and trills. Journal of the International Phonetic Association 7. 46-54.

@article{Ladefoged-et-al-1977,
  author     = {Ladefoged, Peter and Cochran, A. and Disner, S. F.},
  journal    = {Journal of the International Phonetic Association},
  pages      = {46-54},
  title      = {Laterals and trills},
  volume     = {7},
  year       = {1977},
  iso_code   = {whg; wgi},
  olac_field = {general_linguistics; phonology; phonetics; typology},
  wals_code  = {wah}
}