Start with high-confidence east africa travel books, then narrow by subgenre or adjacent topics.
And Home Was Kariakoo
M.G. Vassanji
Lonely Planet Tanzania 8 8th Ed.
Anthony Ham
Ethiopia - Culture Smart!
Culture Smart!, Sarah Howard MS
The Gardens of Mars
John Gimlette
Rwanda
Philip Briggs
Sudan
Sophie Ibbotson, Max Lovell-Hoare
Tanzania - Culture Smart!
Quintin Winks
Rwanda - Culture Smart!
Brian Crawford
The Safari Companion
Richard D. Estes