APA (7e ed.) Bronvermelding

DE BLIJ, H. J. (1970). Geography regions and concepts. John Wiley and Sons.

Chicago (17e ed.) Bronvermelding

DE BLIJ, Harm J. Geography Regions and Concepts. New York: John Wiley and Sons, 1970.

MLA (9e ed.) Bronvermelding

DE BLIJ, Harm J. Geography Regions and Concepts. John Wiley and Sons, 1970.