APA (7th ed.) Citation

Boston, L. M. (1976). The stones of green knowe. Penguin books.

Chicago Style (17th ed.) Citation

Boston, Lucy M. The Stones of Green Knowe. New York: Penguin books, 1976.

MLA (9th ed.) Citation

Boston, Lucy M. The Stones of Green Knowe. Penguin books, 1976.