APA (7 ম সংস্করণ) উদ্ধৃতি

Smith, L. C. (2010). The world in 2050: Four forces shaping civilization's northern future. Dutton, Penguin Group USA.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Smith, Laurence C. The World in 2050: Four Forces Shaping Civilization's Northern Future. New York: Dutton, Penguin Group USA, 2010.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Smith, Laurence C. The World in 2050: Four Forces Shaping Civilization's Northern Future. Dutton, Penguin Group USA, 2010.