Tohutoro APA (7th ed.)

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

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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