APA (7th ed.) Citation

Forsyth, A. R. (1960). Calculus of variations. Dover Pub.

Chicago Style (17th ed.) Citation

Forsyth, Andrew Russell. Calculus of Variations. New York: Dover Pub, 1960.

MLA (9th ed.) Citation

Forsyth, Andrew Russell. Calculus of Variations. Dover Pub, 1960.