Cita APA (7th ed.)
Layard, R. (1972). Cost- benefit analysis. Penguin.
Cita Chicago (17th ed.)
Layard, Richard. Cost- Benefit Analysis. New York: Penguin, 1972.
Cita MLA (9th ed.)
Layard, Richard. Cost- Benefit Analysis. Penguin, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.