APA استشهاد

Layard, R. (1994). Cost-benefit analysis (2nd ed.). Cambridge University Press.

استشهاد بنمط شيكاغو

Layard, Richard. Cost-benefit Analysis. 2nd ed. Cambridge: Cambridge University Press, 1994.

MLA استشهاد

Layard, Richard. Cost-benefit Analysis. 2nd ed. Cambridge University Press, 1994.