APA (7th ed.) Citation

Frost, R., & Untermeyer, L. (1964). The letters of Robert Frost to Louis Untermeyer. J. Cape.

Chicago Style (17th ed.) Citation

Frost, Robert, and Louis Untermeyer. The Letters of Robert Frost to Louis Untermeyer. London: J. Cape, 1964.

MLA (9th ed.) Citation

Frost, Robert, and Louis Untermeyer. The Letters of Robert Frost to Louis Untermeyer. J. Cape, 1964.

Warning: These citations may not always be 100% accurate.