APA
Keats J., . (1981). Poetical works. New York: Oxford University Press.
Chicago
Keats John, . 1981. Poetical works. New York: Oxford University Press.
Harvard
Keats J., . (1981). Poetical works. New York: Oxford University Press.
MLA
Keats John, . Poetical works. New York: Oxford University Press. 1981.
