Citazione Stile APA (7a Edizione)

Williams, M. A. J. (2021). When the Sahara was green: How our greatest desert came to be. Princeton University Press.

Citazione stile Chigago Style (17a edizione)

Williams, M. A. J. When the Sahara Was Green: How Our Greatest Desert Came to Be. Princeton: Princeton University Press, 2021.

Citatione MLA (9a ed.)

Williams, M. A. J. When the Sahara Was Green: How Our Greatest Desert Came to Be. Princeton University Press, 2021.