APA (7e ed.) Bronvermelding

Butler, J. H. (1980). Economic Geography: Spatial and environmen-tal aspects of economic activity. John Wiley.

Chicago (17e ed.) Bronvermelding

Butler, Joseph H. Economic Geography: Spatial and Environmen-tal Aspects of Economic Activity. New York: John Wiley, 1980.

MLA (9e ed.) Bronvermelding

Butler, Joseph H. Economic Geography: Spatial and Environmen-tal Aspects of Economic Activity. John Wiley, 1980.