Sulaiman, I. (1987). The Islamic State and the Challenge of History: Ideals, Policies and Operation of the Sokoto Caliphate. Mansell Publishing Limited.
Citace podle Chicago (17th ed.)Sulaiman, Ibraheem. The Islamic State and the Challenge of History: Ideals, Policies and Operation of the Sokoto Caliphate. London and New York: Mansell Publishing Limited, 1987.
Citace podle MLA (9th ed.)Sulaiman, Ibraheem. The Islamic State and the Challenge of History: Ideals, Policies and Operation of the Sokoto Caliphate. Mansell Publishing Limited, 1987.
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