Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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