Ruggiero, V. R. (1992). Thinking critically about ethical issues (3rd ed.). Mayfield.
Chicago-viite (17. p.)Ruggiero, Vincent Ryan. Thinking Critically About Ethical Issues. 3rd ed. Mountain View, Calif.: Mayfield, 1992.
MLA-viite (8. p.)Ruggiero, Vincent Ryan. Thinking Critically About Ethical Issues. 3rd ed. Mayfield, 1992.
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