एपीए उद्धरण

Fox,Charles. (1987). Introduction to the calculus of variations. Dover.

शिकागो स्टाइल उद्धरण

Fox,Charles. Introduction to the Calculus of Variations. New York: Dover, 1987.

एमएलए उद्धरण

Fox,Charles. Introduction to the Calculus of Variations. Dover, 1987.