Lua APA (7ú heag.)
Penna, A. N. (2015). The human footprint: A global environmental history (Second edition.). Wiley Blackwell.
Lua i Stíl Chicago (17ú heag.)
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Chichester, [England]: Wiley Blackwell, 2015.
Lua MLA (9ú heag.)
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Wiley Blackwell, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.