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2. Susan Eve Woolf, 2014. South African taxi hand signs : documenting the history and significance of taxi hand signs through anthropology and art, including the invention of a tactile shape-language for blind people. Ph.D. thesis. University of the Witwatersrand. URL: http://hdl.handle.net/10539/14982.
3. Transport, Transgression and Politics in African Cities: The Rhythm of Chaos;Agbiboa,2018
4. Paratransit in African Cities: Operations, Regulation and Reform;Behrens,2015