Wilkinson, D., & LaFollette, H. (2013). Futility. John Wiley & Sons.
Cita Chicago (17th ed.)Wilkinson, D., i H. LaFollette. Futility. John Wiley & Sons, 2013.
Cita MLA (9th ed.)Wilkinson, D., i H. LaFollette. Futility. John Wiley & Sons, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.