APA (7th ed.) Citation

Hardy, G. H. (1971). The integration of functions of a single variable (2d ed.). Hafner.

Chicago Style (17th ed.) Citation

Hardy, G. H. The Integration of Functions of a Single Variable. 2d ed. New York: Hafner, 1971.

MLA (9th ed.) Citation

Hardy, G. H. The Integration of Functions of a Single Variable. 2d ed. Hafner, 1971.