APA

Nowell-Smith P. H., . (1964). Ethics. Maryland: Penguin Books.

Chicago

Nowell-Smith P H, . 1964. Ethics. Maryland: Penguin Books.

Harvard

Nowell-Smith P. H., . (1964). Ethics. Maryland: Penguin Books.

MLA

Nowell-Smith P H, . Ethics. Maryland: Penguin Books. 1964.