Cita APA (7a ed.)

Robbins, L. R. (1949). An essay on the nature & significance of economic science (2nd ed., rev., and extended.). Macmillan.

Cita Chicago Style (17a ed.)

Robbins, Lionel Robbins. An Essay on the Nature & Significance of Economic Science. 2nd ed., rev., and extended. London: Macmillan, 1949.

Cita MLA (8a ed.)

Robbins, Lionel Robbins. An Essay on the Nature & Significance of Economic Science. 2nd ed., rev., and extended. Macmillan, 1949.