APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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