Cita APA (7a ed.)

Penna, A. N. (2010). The human footprint: A global environmental history. Wiley Blackwell.

Cita Chicago Style (17a ed.)

Penna, Anthony N. The Human Footprint: A Global Environmental History. Chichester: Wiley Blackwell, 2010.

Cita MLA (8a ed.)

Penna, Anthony N. The Human Footprint: A Global Environmental History. Wiley Blackwell, 2010.