@article{Welmers-1970,
  author     = {Welmers, William E.},
  journal    = {Studies in African Linguistics},
  pages      = {49-59},
  title      = {The derivation of Igbo verb bases},
  volume     = {1},
  year       = {1970},
  iso_code   = {ibo},
  olac_field = {typology; general_linguistics; syntax},
  wals_code  = {igb}
}