Simmons, I. (1989). Changing the face of the earth: Culture, environment, history. Basil Blackwell.
Chicago-viite (17. p.)Simmons, I.G. Changing the Face of the Earth: Culture, Environment, History. Cambridge, Mass.: Basil Blackwell, 1989.
MLA-viite (9. p.)Simmons, I.G. Changing the Face of the Earth: Culture, Environment, History. Basil Blackwell, 1989.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.