APA

hardy g., . (1981). an introduction to the theory of numbers. london: english university press.

Chicago

hardy g.h, . 1981. an introduction to the theory of numbers. london: english university press.

Harvard

hardy g., . (1981). an introduction to the theory of numbers. london: english university press.

MLA

hardy g.h, . an introduction to the theory of numbers. london: english university press. 1981.