Citazione Stile APA (7a Edizione)

Kauffmann, R. M., Read, T. T., & Zettl, A. (1977). The deficiency index problem for powers of ordinary differential expressions. Springer-Verlag.

Citazione stile Chigago Style (17a edizione)

Kauffmann, Robert M., Thomas T. Read, e Anton Zettl. The Deficiency Index Problem for Powers of Ordinary Differential Expressions. Berlín: Springer-Verlag, 1977.

Citatione MLA (9a ed.)

Kauffmann, Robert M., et al. The Deficiency Index Problem for Powers of Ordinary Differential Expressions. Springer-Verlag, 1977.