Robert S. Kramer, Richard A. Lobban Jr., Carolyn Fluehr-Lobban. (2013) Historical Dictionary of the Sudan, 4‑a eldono, Historical Dictionaries of Africa, Lanham, Maryland, USA: Scarecrow Press, an imprint of Rowman & Littlefield, p. 361. ISBN 978-0-8108-6180-0. “QUBBA. The Arabic name for the tomb of a holy man... A qubba is usually erected over the grave of a holy man identified variously as wali (saint), faki, or shaykh since, according to folk Islam, this is where his baraka [blessings] is believed to be strongest...”.
