Problems of moral philosophy an introduction to ethics par Taylor, Paul W.

Principles of ethics an introduction par Taylor, Paul W.

Knowledge and value par Sprague, Elmer, ed

Problems of moral philosophy an introduction to ethics

Normative discourse par Taylor, Paul W.

Knowledge and value introductory readings in philosophy par Sprague, Elmer, ed

Knowledge and value introductory readings in philosophy par Sprague, Elmer