@inbook{wals-1,
  address   = {Leipzig},
  author    = {Ian Maddieson},
  booktitle = {The World Atlas of Language Structures Online},
  editor    = {Matthew S. Dryer and Martin Haspelmath},
  publisher = {Max Planck Institute for Evolutionary Anthropology},
  title     = {Consonant Inventories},
  url       = {http://wals.info/chapter/1},
  year      = {2013}
}

@inbook{wals-7,
  address   = {Leipzig},
  author    = {Ian Maddieson},
  booktitle = {The World Atlas of Language Structures Online},
  editor    = {Matthew S. Dryer and Martin Haspelmath},
  publisher = {Max Planck Institute for Evolutionary Anthropology},
  title     = {Glottalized Consonants},
  url       = {http://wals.info/chapter/7},
  year      = {2013}
}

@incollection{Lindblom-and-Maddieson-1988,
  address    = {London},
  author     = {Lindblom, Björn and Maddieson, Ian},
  booktitle  = {Language, Speech and Mind},
  editor     = {Li, C. and Hyman, L. M.},
  pages      = {62-78},
  publisher  = {Routledge},
  title      = {Phonetic Universals in Consonant Systems},
  year       = {1988},
  iso_code   = {},
  olac_field = {},
  wals_code  = {}
}