APA (7th ed.) Citation

Green, A. K. (1969). A difficult problem: The staircase at the Heart's Delight, and other stories. Garrett Press.

Chicago Style (17th ed.) Citation

Green, Anna Katharine. A Difficult Problem: The Staircase at the Heart's Delight, and Other Stories. [New York]: Garrett Press, 1969.

MLA (9th ed.) Citation

Green, Anna Katharine. A Difficult Problem: The Staircase at the Heart's Delight, and Other Stories. Garrett Press, 1969.