Dyfyniad APA

WHEELER, J. O., & MULLER, P. O. (1981). Economy geography. John Wiley and Sons.

Dyfyniad Arddull Chicago

WHEELER, James O., and Peter O. MULLER. Economy Geography. New York: John Wiley and Sons, 1981.

Dyfyniad MLA

WHEELER, James O., and Peter O. MULLER. Economy Geography. John Wiley and Sons, 1981.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.