APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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