APA
Rachels J., . (1999). The elements of moral philosophy. Boston: McGraw-Hill College.
Chicago
Rachels James, . 1999. The elements of moral philosophy. Boston: McGraw-Hill College.
Harvard
Rachels J., . (1999). The elements of moral philosophy. Boston: McGraw-Hill College.
MLA
Rachels James, . The elements of moral philosophy. Boston: McGraw-Hill College. 1999.