Dyfyniad APA

O'SULLIVIAN, P. (1981). Geographical economics. John Wiley and Sons.

Dyfyniad Arddull Chicago

O'SULLIVIAN, Patrick. Geographical Economics. New York: John Wiley and Sons, 1981.

Dyfyniad MLA

O'SULLIVIAN, Patrick. Geographical Economics. John Wiley and Sons, 1981.

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