Knapp, W., & Barbour, N. (1977). North West Africa: A political and economic survey (3d ed.). Oxford University Press.
Citace podle Chicago (17th ed.)Knapp, Wilfrid, a Nevill Barbour. North West Africa: A Political and Economic Survey. 3d ed. Oxford ; New York: Oxford University Press, 1977.
Citace podle MLA (8th ed.)Knapp, Wilfrid, a Nevill Barbour. North West Africa: A Political and Economic Survey. 3d ed. Oxford University Press, 1977.
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