APA
Nowell-Smith P., . (1961). Ethics. Baltimore; Maryland: Penguin Books.
Chicago
Nowell-Smith P.H, . 1961. Ethics. Baltimore; Maryland: Penguin Books.
Harvard
Nowell-Smith P., . (1961). Ethics. Baltimore; Maryland: Penguin Books.
MLA
Nowell-Smith P.H, . Ethics. Baltimore; Maryland: Penguin Books. 1961.
