Cita APA

Smith, L. C. (2011). The world in 2050: Four forces shaping civilization's northern future. Dutton ; Penguin.

Citación estilo Chicago

Smith, Laurence C. The World in 2050: Four Forces Shaping Civilization's Northern Future. New York: Dutton ; Penguin, 2011.

Cita MLA

Smith, Laurence C. The World in 2050: Four Forces Shaping Civilization's Northern Future. Dutton ; Penguin, 2011.