APA aipamena

Knowles, R. (1981). Economic and Social Geography (Fourth Edition). ELSEVIER.

Chicago Style aipamena

Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.

MLA aipamena

Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.