@book{halkin1911,
  address = {Bruxelles},
  author  = {Halkin, J.},
  key     = {Halkin (1911)},
  pages   = {1-616},
  series  = {Collec. Monog. Ethnog.},
  title   = {Les Ababua},
  volume  = {7},
  year    = {1911}
}