@book{gBaumbachTsonga,
  address   = {Pretoria},
  author    = {Baumbach, Erdmann J. M.},
  pages     = {311},
  publisher = {Pretoria: University of South Africa},
  series    = {Studia originalia},
  title     = {Analytical Tsonga grammar},
  volume    = {3},
  year      = {1987}
}