Styl cytowania APA

Gelfand, I. M., & Fomin, S. V. (1963). Calculus of variations.

Styl cytowania Chicago

Gelfand, I M., i S V. Fomin. Calculus of Variations. Prentice-Hall Inc., Englewood Cliffs, New Jersey, 1963.

Styl cytowania MLA

Gelfand, I M., i S V. Fomin. Calculus of Variations. 1963.