APA

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

Chicago

Thorp Willard, . 1960. American writing in the twentieth century. Cambridge: Harvard University Press.

Harvard

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

MLA

Thorp Willard, . American writing in the twentieth century. Cambridge: Harvard University Press. 1960.