APA (7th ed.) Zitazioa

Levinson, N. (1940). Gap and density theorems. American Mathematical Society.

Chicago Style (17th ed.) Zitazioa

Levinson, Norman. Gap and Density Theorems. New York: American Mathematical Society, 1940.

MLA (9th ed.) Zitazioa

Levinson, Norman. Gap and Density Theorems. American Mathematical Society, 1940.