@book{vanoverbergh1907b,
  address = {Bruxelles},
  author  = {Van Overbergh, C.},
  key     = {Van Overbergh (1907b)},
  pages   = {1-470},
  series  = {Coll. Monog. Ethnog.},
  title   = {Les Mayombe},
  volume  = {2},
  year    = {1907}
}