APA (7th ed.) Citation

Herrera, I. (1974). A general formulation of variotional principles. UNAM.

Chicago Style (17th ed.) Citation

Herrera, Ismael. A General Formulation of Variotional Principles. México: UNAM, 1974.

MLA (9th ed.) Citation

Herrera, Ismael. A General Formulation of Variotional Principles. UNAM, 1974.

Warning: These citations may not always be 100% accurate.