APA (7e ed.) Bronvermelding

Abler, R. (1975). Human geography in a shrinking world. Duxbury Press.

Chicago (17e ed.) Bronvermelding

Abler, Ronald. Human Geography in a Shrinking World. North Scituate, Mass: Duxbury Press, 1975.

MLA (9e ed.) Bronvermelding

Abler, Ronald. Human Geography in a Shrinking World. Duxbury Press, 1975.