Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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