APA (7th ed.) Citation

Symonds, J. A. (1970). In the key of blue: And other prose essays. AMS Press.

Chicago Style (17th ed.) Citation

Symonds, John Addington. In the Key of Blue: And Other Prose Essays. New York: AMS Press, 1970.

MLA (9th ed.) Citation

Symonds, John Addington. In the Key of Blue: And Other Prose Essays. AMS Press, 1970.