Snodgrass, W. D. W. (1960). Heart's needle. Marvell Press.
Cita Chicago (17th ed.)Snodgrass, William De Witt. Heart's Needle. Hessle, Yorkshire: Marvell Press, 1960.
Cita MLA (8th ed.)Snodgrass, William De Witt. Heart's Needle. Marvell Press, 1960.
Atenció: Aquestes cites poden no estar 100% correctes.