APA

Duffy J., . (1945). A philosophy of poetry, based on thomistic principles. Washington: The Catholic University Press.

Chicago

Duffy John, . 1945. A philosophy of poetry, based on thomistic principles. Washington: The Catholic University Press.

Harvard

Duffy J., . (1945). A philosophy of poetry, based on thomistic principles. Washington: The Catholic University Press.

MLA

Duffy John, . A philosophy of poetry, based on thomistic principles. Washington: The Catholic University Press. 1945.