Cita APA

PERPILLOU, A. (1977). Human geography.-- ed.2. Longman Group.

Citación estilo Chicago

PERPILLOU, A.V. Human Geography.-- Ed.2. New York: Longman Group, 1977.

Cita MLA

PERPILLOU, A.V. Human Geography.-- Ed.2. Longman Group, 1977.