APA (7th ed.) Citation

(1973). The Wave equations, classification and characteristics, Elliptic and parabolic equations. Open University press.

Chicago Style (17th ed.) Citation

The Wave Equations, Classification and Characteristics, Elliptic and Parabolic Equations. Milton Keynes: Open University press, 1973.

MLA (9th ed.) Citation

The Wave Equations, Classification and Characteristics, Elliptic and Parabolic Equations. Open University press, 1973.