Citazione APA

Gelfand, I. M., & Fomin, S. V. (1963). Calculus of variations (Rev. English ed.). Prentice-Hall.

Stile di citazione Chicago

Gelfand, I. M., e S. V. Fomin. Calculus of Variations. Rev. English ed. Englewood Cliffs, N.J.: Prentice-Hall, 1963.

Citazione MLA

Gelfand, I. M., e S. V. Fomin. Calculus of Variations. Rev. English ed. Prentice-Hall, 1963.