1. Old Kanuri capitals;Bivar;J. Afr. Hist.,1962
2. The Glass Beads from the Tunica Treasure;Brain,1981
3. Chemical composition of late 18th- and 19th-century glass beads from western North America: clues to sourcing beads;Burgess;Beads,2007
4. Narrative of Travels and Discoveries in Northern and Central Africa in the Years 1822, 1823, and 1824; Extending across the Great Desert to the Tenth Degree of Northern Latitude, and from Kouka in Bornou, to Sackatoo, the Capital of the Fellatah Empire;Clapperton,1826