APA (7th ed.) Citation

O'Neill, E. (1956). Long day's journey into night. Yale University Press.

Chicago Style (17th ed.) Citation

O'Neill, Eugene. Long Day's Journey into Night. New Haven: Yale University Press, 1956.

MLA (8th ed.) Citation

O'Neill, Eugene. Long Day's Journey into Night. Yale University Press, 1956.

Warning: These citations may not always be 100% accurate.