Dyfyniad APA
Penna, A. N. (2015). The human footprint: A global environmental history (Second edition.). Wiley Blackwell.
Dyfyniad Arddull Chicago
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Chichester, [England]: Wiley Blackwell, 2015.
Dyfyniad MLA
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Wiley Blackwell, 2015.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.