The booklist on this subreddit has some. I've noticed it's actually hard to find good books on Africa.

The booklist is good. i would recommend he UNESCO set of histories. 1. they are free and can be downloaded 2. at 700 pages per volume (each about 200 years or so) they do a good job at providing a large amount of data. When i was looking for a good source of african history which wasn't post colonial that's what i found.

That list is great. I would also add Ralph A. Austen's Trans-Saharan Africa in World History, which is short but rich, and Africa: A Biography of the Continent, by John Reader, which isn't distinctly history but has much of it. One that tells a fascinating chapter of African history, much forgotten, the Fulani jihad, is The Sword of Truth: The Life & Times of Shehu Usuman Dan Fadio, by Mervyn Hiskett, but this is likely tough to come across.

Can you clarify what sort of sources (Primary or Secondary) you're looking for? Also it would really help if you could give a rough time period and geographic area that you want sources for?