APA (7th ed.) Citation

Yeats, W. B., Finneran, R. J., Harper, G. M., & Murphy, W. M. (1977). Letters to W. B. Yeats. Columbia University Press.

Chicago Style (17th ed.) Citation

Yeats, W. B., Richard J. Finneran, George Mills Harper, and William M. Murphy. Letters to W. B. Yeats. New York: Columbia University Press, 1977.

MLA (9th ed.) Citation

Yeats, W. B., et al. Letters to W. B. Yeats. Columbia University Press, 1977.