Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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