APA

Greenberg R. A., Hepburn J. G., . (1961). Robert Frost, an introduction. New York: Holt, Rinehart and Winston.

Chicago

Greenberg Robert A, Hepburn James G, . 1961. Robert Frost, an introduction. New York: Holt, Rinehart and Winston.

Harvard

Greenberg R. A., Hepburn J. G., . (1961). Robert Frost, an introduction. New York: Holt, Rinehart and Winston.

MLA

Greenberg Robert A, Hepburn James G, . Robert Frost, an introduction. New York: Holt, Rinehart and Winston. 1961.