APA (7th ed.) Citation

Sagan, H. (1969). Introduction to the calculus of variations / by H. Sagan. McGraw-Hill.

Chicago Style (17th ed.) Citation

Sagan, H. Introduction to the Calculus of Variations / by H. Sagan. McGraw-Hill, 1969.

MLA (9th ed.) Citation

Sagan, H. Introduction to the Calculus of Variations / by H. Sagan. McGraw-Hill, 1969.

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