@incollection{25304,
  address          = {Philadelphia},
  author           = {Simmons, Donald},
  booktitle        = {Proceedings of the 5th international congress of anthropological and ethnological sciences},
  publisher        = {University of Pennsylvania},
  title            = {Tonality on Efik signal communication},
  year             = {1959},
  inlg             = {English [eng]},
  keywords         = {;waf;nga;lng;phn;tnl;t.241;},
  lgcode           = {Efik [efi] (autotranslated from Maho's coding system)},
  macro_area       = {Africa},
  src              = {eballiso2009, weball},
  subject_headings = {waf, nga, lng, phn, tnl, t.241}
}