APA (7th ed.) Citation

Forsyth, A. R. (1960). Calculus of variations (1. publ.). Dover Publ.

Chicago Style (17th ed.) Citation

Forsyth, Andrew R. Calculus of Variations. 1. publ. New York: Dover Publ, 1960.

MLA (9th ed.) Citation

Forsyth, Andrew R. Calculus of Variations. 1. publ. Dover Publ, 1960.