@misc{Haviland-et-al-nd,
  author       = {John Haviland, Stuart Robinson and Gutierrez, Esteban},
  howpublished = {online},
  title        = {An On-line Tzotzil Grammar},
  url          = {http://www.cerf.net/esteban/Tzotzil/},
  year         = {1000},
  iso_code     = {tzz},
  olac_field   = {phonetics; typology; general_linguistics; phonology},
  wals_code    = {tzz}
}