Cita APA (7th ed.)
Sperling, D., & Gordon, D. (2009). Two billion cars: Driving toward sustainability. Oxford University Press.
Cita Chicago (17th ed.)
Sperling, Daniel, i Deborah Gordon. Two Billion Cars: Driving Toward Sustainability. Oxford ; New York: Oxford University Press, 2009.
Cita MLA (9th ed.)
Sperling, Daniel, i Deborah Gordon. Two Billion Cars: Driving Toward Sustainability. Oxford University Press, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.