Cita APA (7a ed.)

Hellwig, G. (1967). Differential operators of mathematical physics: An introduction. Addison-Wesley.

Cita Chicago Style (17a ed.)

Hellwig, Günter. Differential Operators of Mathematical Physics: An Introduction. Reading, Mass.: Addison-Wesley, 1967.

Cita MLA (8a ed.)

Hellwig, Günter. Differential Operators of Mathematical Physics: An Introduction. Addison-Wesley, 1967.