Dyfyniad APA

Hartshorn, T. A., & Alexander, J. W. (1987). Economic geography (3rd ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Hartshorn, Truman A., and John W. Alexander. Economic Geography. 3rd ed. Englewood Cliffs: Prentice Hall, 1987.

Dyfyniad MLA

Hartshorn, Truman A., and John W. Alexander. Economic Geography. 3rd ed. Prentice Hall, 1987.

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