APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Hadley, G., and Murray C. Kemp. Variational Methods in Economics. Amsterdam [etc.]: North-Holland [etc.], 1971.

MLA (9th ed.) Citation

Hadley, G., and Murray C. Kemp. Variational Methods in Economics. North-Holland [etc.], 1971.