Cita APA (7a ed.)
Penna, A. N. (2015). The human footprint: A global environmental history (Second edition.). Wiley Blackwell.
Cita Chicago Style (17a ed.)
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Chichester, [England]: Wiley Blackwell, 2015.
Cita MLA (9a ed.)
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Wiley Blackwell, 2015.
Precaución: Estas citas no son 100% exactas.