Citazione Stile APA (7a Edizione)

Ponting, C. (1991). A green history of the world. Penguin Group.

Citazione stile Chigago Style (17a edizione)

Ponting, Clive. A Green History of the World. New York: Penguin Group, 1991.

Citatione MLA (9a ed.)

Ponting, Clive. A Green History of the World. Penguin Group, 1991.