APA

Poirier R., . (1977). Robert Frost: the work of knowing. New York: Oxford University Press.

Chicago

Poirier Richard, . 1977. Robert Frost: the work of knowing. New York: Oxford University Press.

Harvard

Poirier R., . (1977). Robert Frost: the work of knowing. New York: Oxford University Press.

MLA

Poirier Richard, . Robert Frost: the work of knowing. New York: Oxford University Press. 1977.