Trích dẫn APA

Frost, R. (1946). The poems of Robert Frost: With an introductory essay, "The constant symbol," by the author. New York: Modern Library.

Trích dẫn kiểu Chicago

Frost, Robert. The Poems of Robert Frost: With an Introductory Essay, "The Constant Symbol," By the Author. New York: Modern Library, 1946.

Trích dẫn MLA

Frost, Robert. The Poems of Robert Frost: With an Introductory Essay, "The Constant Symbol," By the Author. New York: Modern Library, 1946.

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.