APA

Frost R., . (1963). The letters of Robert Frost to Louis Untermeyer. [New York: Holt, Rinehart and Winston].

Chicago

Frost Robert, . 1963. The letters of Robert Frost to Louis Untermeyer. [New York: Holt, Rinehart and Winston].

Harvard

Frost R., . (1963). The letters of Robert Frost to Louis Untermeyer. [New York: Holt, Rinehart and Winston].

MLA

Frost Robert, . The letters of Robert Frost to Louis Untermeyer. [New York: Holt, Rinehart and Winston]. 1963.