APA (7th ed.) Citation

Thorp, W. (1960). American writing in the twentieth century. Harvard University Press.

Chicago Style (17th ed.) Citation

Thorp, Willard. American Writing in the Twentieth Century. Cambridge (Massachusetts): Harvard University Press, 1960.

MLA (9th ed.) Citation

Thorp, Willard. American Writing in the Twentieth Century. Harvard University Press, 1960.