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. Massachusetts: Harvard University Press, 1963.

Cita MLA (8a ed.)

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