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} }