Cita APA (7a ed.)

Thorp, W. (1963). American writing in the twentieth century. Harvard University Press.

Cita Chicago Style (17a ed.)

Thorp, Willard. American Writing in the Twentieth Century. Cambridge, MA: Harvard University Press, 1963.

Cita MLA (8a ed.)

Thorp, Willard. American Writing in the Twentieth Century. Harvard University Press, 1963.