APA استشهاد

Bolza, O. (1961). Lectures on the calculus of variations. Dover.

استشهاد بنمط شيكاغو

Bolza, Oskar. Lectures on the Calculus of Variations. New York: Dover, 1961.

MLA استشهاد

Bolza, Oskar. Lectures on the Calculus of Variations. Dover, 1961.