APA (7th ed.) Citation

Sommerfeld, A. (1964). Partial differential equations in physics. Academic Press.

Chicago Style (17th ed.) Citation

Sommerfeld, Arnold. Partial Differential Equations in Physics. New York: Academic Press, 1964.

MLA (9th ed.) Citation

Sommerfeld, Arnold. Partial Differential Equations in Physics. Academic Press, 1964.