There are several books that provide a general historical context and political and economic analysis relevant to the movements in this period, as well as useful (though condensed) information on protests in particular countries:
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E. I.2.1. Popular Movements for Multiparty Democracy: 1988-1992
Volume One -> E. Resisting Oppressive, Dictatorial, Military or Authoritarian Rule -> E. I. Africa - Sub-Saharan -> E. I.2. Resisting Repressive and Authoritarian Regimes -> E. I.2.1. Popular Movements for Multiparty Democracy: 1988-1992