APA (7th ed.) Citation

O'Brien, D. P. (1975). The classical economists / by D.P. O'Brien. Clarendon Press.

Chicago Style (17th ed.) Citation

O'Brien, D. P. The Classical Economists / by D.P. O'Brien. Oxford: Clarendon Press, 1975.

MLA (9th ed.) Citation

O'Brien, D. P. The Classical Economists / by D.P. O'Brien. Clarendon Press, 1975.

Warning: These citations may not always be 100% accurate.