APA (7th ed.) Citation

Frost, R., Sheehy, D., Richardson, M., & Faggen, R. (2014). The Letters of Robert Frost, Volume 1: 1886–1920.

Chicago Style (17th ed.) Citation

Frost, Robert, Donald Sheehy, Mark Richardson, and Robert Faggen. The Letters of Robert Frost, Volume 1: 1886–1920. 2014.

MLA (9th ed.) Citation

Frost, Robert, et al. The Letters of Robert Frost, Volume 1: 1886–1920. 2014.