@book{schweinfurth1874,
  address   = {London},
  author    = {Schweinfurth, G.},
  key       = {Schweinfurth (1874)},
  publisher = {Sampson Low, Marston, Low & Searle},
  title     = {The heart of Africa},
  url       = {https://archive.org/details/heartofafrica01schw},
  volume    = {1},
  year      = {1874}
}