found: Work cat.: Kayongo, K. Reciprocity and interdependence : the rise and fall of the Kololo Empire in southern Africa in the 19th century, 1987.
found: Grotpeter, J. Historical dictionary of Zambia, 1998(Kololo (Makololo); Sotho-speaking people from area of the Orange Free State; fled across area of Botswana ca. 1830; conquered the Lozi, who adopted their language; disappeared after defeat by the Lozi in 1864)
found: Encyclopedia of Africa south of the Sahara, 1997:v. 3, p. 58 (Kololo ruled the Lozi from 1830s until 1864)