Knowles, R. (1981). Economic and Social Geography (Fourth Edition). ELSEVIER.
Citazione stile Chigago Style (17a edizione)Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.
Citatione MLA (8a ed.)Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.