Reddit mentions of Thomas Sankara: An African Revolutionary (Ohio Short Histories of Africa)

Thomas Sankara - African Revolutionary is probably your best bet. It delves just as much into his government as it does his own personal story, which is kind of inevitable considering how intertwined both stories are.

Quite positive, he had good environmental policies, increased women's rights, built a system of community self-organization via the CDRs, hospitals, schools etc. were built all over the country and they had lots of public works projects, he fought against reactionary practises and powers exercised by tribal leaders, fought imperialism, established land reform, nationalized industries, literacy and vaccination cmapaigns and encouraged co-operatives. he was by no means the perfect Socialist revolutionary but he didn't seek any sort of cult of personality improved people's lives in various ways and did this under incredibly harsh conditions. A book abut him i would sugest is Thomas Sankara: An African Revolutionary by Ernest Harsch.

Thomas Sankara: An African Revolutionary is pretty good and I haven't read it myself but Thomas Sankara Speaks: The Burkina Faso Revolution 1983–87 sounds pretty good.