Cita APA (7a ed.)

Harper, M. M. (2006). Wisdom of two: The spiritual and literary collaboration of George and W.B. Yeats. Oxford University Press.

Cita Chicago Style (17a ed.)

Harper, Margaret Mills. Wisdom of Two: The Spiritual and Literary Collaboration of George and W.B. Yeats. Oxford ; New York: Oxford University Press, 2006.

Cita MLA (8a ed.)

Harper, Margaret Mills. Wisdom of Two: The Spiritual and Literary Collaboration of George and W.B. Yeats. Oxford University Press, 2006.