Knapp, W., & Barbour, N. (1977). North West Africa: A political and economic survey (3d ed.). Oxford University Press.
Dyfyniad Arddull ChicagoKnapp, Wilfrid, and Nevill Barbour. North West Africa: A Political and Economic Survey. 3d ed. Oxford ; New York: Oxford University Press, 1977.
Dyfyniad MLAKnapp, Wilfrid, and Nevill Barbour. North West Africa: A Political and Economic Survey. 3d ed. Oxford University Press, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.