I have several Osprey books on the various post WW2 African wars and they provide a nice overview.
I find the African and South American wars very interesting (1930s and post WW2) but just haven't had the time to do a great deal of reading on them. I have a pile of books saved on my Amazon wish list.
I haven't read them, so not an endorsement but a few that have caught my eye:
Recce: Small Team Missions Behind Enemy Lines by Koos Stadler
Continent Ablaze: The Insurgency Wars in Africa 1960 to the Present by John W. Turner
Counterinsurgency in Africa: The Portuguese Way of War 1961-74 by John P. Cann
Portugal's War in Angola by W.A. van der Waals
Biafra: the Nigerian Civil War 1967-70 by Peter Baxter
Katanga 1960-63: Mercenaries, Spies and the African Nation that waged war on the World by Christopher Othen
Wars and insurgencies of Uganda 1971-1994 by Tom Cooper and Adrien Fontanellaz
The Flechas: Insurgeant hunting in Eastern Angola 1965-74 by John P. Cann
The Paras: Portugals first elite force in Africa 1961-74 by John P. Cann (if you search John P. Cann he has done a bunch of book on Portugal's wars in Africa).
Zambezi Valley Insurgency: Early Rhodesian Bush War Operations by J.R.T. Wood
Rhodesian Fire Force 1966-80 by Peter Baxter
Bush War Rhodesia 1966-80 by Peter Baxter (search Peter Baxter he has written several books on African Wars)
Not post war but I have read The Great War in Africa 1914-18 by Byron Farwell. It covers all of the conflicts in Africa during WW1 where most books just look at the operations surrounding Paul von Lettow-Vorbeck in East Africa. To be fair that was the big show in Africa at the time and it accounts for the bulk of this book as well. A very overlooked part of WW1 and quite interesting, nothing at all like the trench warfare in Western Europe.
Fiction but Frederick Forsyth's novel The Dogs of War is a good read about a mecenary operation to overthrow an African nation.