@article{oyler1918a,
  author  = {Oyler, D. S.},
  journal = {Sudan Notes and Records},
  key     = {Oyler (1918a)},
  number  = {2},
  pages   = {107-115},
  title   = {Nikawng and the Shilluk migration},
  volume  = {1},
  year    = {1918}
}