Cita APA (7a ed.)

Hellwig, G. (1964). Partial differential equations: An introduction. Blaisdell Pub. Co.

Cita Chicago Style (17a ed.)

Hellwig, Günter. Partial Differential Equations: An Introduction. New York [etc.]: Blaisdell Pub. Co, 1964.

Cita MLA (9a ed.)

Hellwig, Günter. Partial Differential Equations: An Introduction. Blaisdell Pub. Co, 1964.