APA

Rachels J., . (1998). The Elements of Moral Philosophy. Boston: McGraw-Hill.

Chicago

Rachels J, . 1998. The Elements of Moral Philosophy. Boston: McGraw-Hill.

Harvard

Rachels J., . (1998). The Elements of Moral Philosophy. Boston: McGraw-Hill.

MLA

Rachels J, . The Elements of Moral Philosophy. Boston: McGraw-Hill. 1998.