APA (7th ed.) Citation

O'Donovan, M. (1969). A set of variations: Twenty-seven stories. Knopf.

Chicago Style (17th ed.) Citation

O'Donovan, Michael. A Set of Variations: Twenty-seven Stories. New York: Knopf, 1969.

MLA (9th ed.) Citation

O'Donovan, Michael. A Set of Variations: Twenty-seven Stories. Knopf, 1969.