Duignan, P., & Conover, H. F. (1971). Guide to research and reference works on Sub-Saharan Africa. Hoover Institution Press, Stanford University.
Citace podle Chicago (17th ed.)Duignan, Peter, a Helen Field Conover. Guide to Research and Reference Works on Sub-Saharan Africa. Stanford, Calif: Hoover Institution Press, Stanford University, 1971.
Citace podle MLA (9th ed.)Duignan, Peter, a Helen Field Conover. Guide to Research and Reference Works on Sub-Saharan Africa. Hoover Institution Press, Stanford University, 1971.
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