Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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