Map of Major States in the Southern Savannas, Mid-Nineteenth Century. Based on information from Jan Vansina, <i>Kingdoms of the Savanna</i>, Madison, 1968.<br> The map includes the Lunda Empire (with the Lunda heartland), the Luba kingdoms, the Luba-Kasai and the Kuba kingdom as they were thought to have been around 1850.
Library of Congress
1994
<a rel="nofollow" class="external text" href="https://www.loc.gov/resource/frdcstdy.zairecountrystud00medi_0/?sp=72"><i>Zaire : a country study</i></a> (1994)