I'd like to recommend Josiah Brownall's "The Collapse of Rhodesia," a historical look at the Rhodesian tragedy from a fairly new perspective. While nearly all other academic treatments of the Rhodesian story is focused on their military campaign, Brownall is the first academic to posit that the primary source of their eventual downfall was demography & an implicit race war. The revelation that their settler colony of ~200k White Rhodesians was outnumbered 17:1 by the local African population, far more than the Rhodesians initially believed themselves to be (they thought it was closer to 5:1), was shocking. Brownall's theory is that it was this asymmetric demography that ultimately brought down Rhodesia. After the first official census in 1962, the revelation that they were up against a much larger force who was increasingly militarily backed by communist forces was a major source of existential anxiety amongst the Rhodesians. Alongside their newly confirmed theories of African breeding patterns & the fertility of the rural African populations, the revelation of their racial asymmetry created another problem - it caused the rate of White settlers coming to Rhodesia to plummet and was the source of a large amount of emigration of those already there. Among the Rhodesians, you had a core group of people who were there to the bitter end, but Rhodesian loyalty was in very little supply amongst the White settlers. Unable to live a life of comfort and material wealth, the settlers would simply leave - this just wasn't what they signed up for. The economic effects of this was rather devastating to Rhodesia, and directly impacted their ability to wage war in an effective manner.
At this point, you have a 17:1 outnumbering of the White Rhodesian population by the local African population. Then you begin to see a drop in settlers moving to Rhodesia and an increase in Rhodesians emigrating. The anxiety of being extremely outnumbered also appears to have hampered White fertility in Rhodesia, as "natural" birth rates appeared to drop after official numbers of the census appeared. On top of this, all of their efforts to tackle the African population problem were, at best, barely a drop in the bucket, and African Nationalist momentum was building rapidly amongst the rural populations, despite there being multiple competing organizations amongst the Nationalist groups. The Nationalist movements recognized the Rhodesian "family planning" techniques for what they were - war by other means, and they were largely successful in getting the African population to ignore the efforts of the Rhodesians in this capacity. All of these internal problems amplified the severity of the external problems they were facing, and Brownall claims that it ultimately brought down the Rhodesian government.
Overall, an interesting read.