APA (7th ed.) Citation

Yeats, W. B., Finneran, R. J., Harper, G. M., & Murphy, W. M. (1977). Letters to W. B. Yeats: Volume 1. 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: Volume 1. Columbia University press, 1977.

MLA (9th ed.) Citation

Yeats, W. B., et al. Letters to W. B. Yeats: Volume 1. Columbia University press, 1977.