@book{verhulpen1936,
  address   = {Anvers},
  author    = {Verhulpen, E.},
  key       = {Verhulpen (1936)},
  pages     = {534},
  publisher = {Anvers: L'Avenir belge},
  title     = {Baluba et Balubaises du Katanga},
  year      = {1936}
}