The first ethnologists to work with the Bongo language were John Petherick, who published Bongo word lists in his 1861 work, Egypt, the Soudan, and Central Africa; Theodor von Heuglin, who also published Bongo word lists in Reise in das Gebiet des Weissen Nil, &c. 1862-1864 in 1869; and Georg August Schweinfurth, who contributed sentences and vocabularies in his Linguistische Ergebnisse, Einer Reise Nach Centralafrika in 1873.[5] E. E. Evans-Pritchard published additional Bongo word lists in 1937.[6]