Greenspan, A. (2007). The age of turbulence: Adventures in a new world. Penguin Press.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিGreenspan, Alan. The Age of Turbulence: Adventures in a New World. New York: Penguin Press, 2007.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিGreenspan, Alan. The Age of Turbulence: Adventures in a New World. Penguin Press, 2007.