APA

Prichard H. A., . (1957). Moral obligation. Oxford: At the Clarendon Press.

Chicago

Prichard H A, . 1957. Moral obligation. Oxford: At the Clarendon Press.

Harvard

Prichard H. A., . (1957). Moral obligation. Oxford: At the Clarendon Press.

MLA

Prichard H A, . Moral obligation. Oxford: At the Clarendon Press. 1957.