APA (7th ed.) Citation

Sommerfeld, A. (1949). Partial differential equations in physics / by Arnold Sommerfeld. Academic Press.

Chicago Style (17th ed.) Citation

Sommerfeld, Arnold. Partial Differential Equations in Physics / by Arnold Sommerfeld. New York: Academic Press, 1949.

MLA (9th ed.) Citation

Sommerfeld, Arnold. Partial Differential Equations in Physics / by Arnold Sommerfeld. Academic Press, 1949.

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