Cita APA (7th ed.)

Sorensen, D. C., & Wets, R. J. B. (1982). Nondifferential and variational techniques in optimization. North-Holland.

Cita Chicago (17th ed.)

Sorensen, D. C., i R. J. B. Wets. Nondifferential and Variational Techniques in Optimization. Amsterdam: North-Holland, 1982.

Cita MLA (9th ed.)

Sorensen, D. C., i R. J. B. Wets. Nondifferential and Variational Techniques in Optimization. North-Holland, 1982.