MLA

Watkin, E. I. A Philosophy of Form. 2nd ed. London: Sheed and Ward, 1938.

APA

Watkin, E. I. (1938). A philosophy of form. 2nd ed. London: Sheed and Ward.

Chicago

Watkin, E. I. A Philosophy of Form. 2nd ed. London: Sheed and Ward, 1938.