Christopher, R. W. (1994). Geosystems: An introduction to physical geography (2nd ed.). Macmillan.
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Dyfyniad Arddull Chicago
Christopher, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. New York: Macmillan, 1994.
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Dyfyniad MLA
Christopher, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. Macmillan, 1994.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.