APA (7th ed.) Citation

Hellwig, G. (1977). Partial differential equations: An introduction (2d ed.). B. G. Teubner.

Chicago Style (17th ed.) Citation

Hellwig, Günter. Partial Differential Equations: An Introduction. 2d ed. Stuttgart: B. G. Teubner, 1977.

MLA (8th ed.) Citation

Hellwig, Günter. Partial Differential Equations: An Introduction. 2d ed. B. G. Teubner, 1977.