@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}
}