APA (7th ed.) Citation

Hadley, G., & Kemp, M. C. (1971). Variational methods in economics. North-Holland.

Chicago Style (17th ed.) Citation

Hadley, George, and Murray C. Kemp. Variational Methods in Economics. Amsterdam: North-Holland, 1971.

MLA (9th ed.) Citation

Hadley, George, and Murray C. Kemp. Variational Methods in Economics. North-Holland, 1971.