APA
Layard R., . (1972). Cost- benefit analysis. New York: Penguin.
Chicago
Layard Richard, . 1972. Cost- benefit analysis. New York: Penguin.
Harvard
Layard R., . (1972). Cost- benefit analysis. New York: Penguin.
MLA
Layard Richard, . Cost- benefit analysis. New York: Penguin. 1972.