Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

Hellwig, Günter. Differential Operators of Mathematical Physics: An Intro-. Addison-Wesley Pub. Co., 1967.