APA-viite (7. p.)

Howkins, A. (2016). The Polar regions: An environmental history. Polity Press.

Chicago-viite (17. p.)

Howkins, Adrian. The Polar Regions: An Environmental History. Cambridge, United Kingdom: Polity Press, 2016.

MLA-viite (9. p.)

Howkins, Adrian. The Polar Regions: An Environmental History. Polity Press, 2016.