Tohutoro APA (7th ed.)
Frankena, W. K. Ethics. Prentice-Hall.
Tohutoru Kātū Chicago (17th ed.)
Frankena, William K. Ethics. Englewood Cliffs, EUA: Prentice-Hall.
Tohutoro MLA (9th ed.)
Frankena, William K. Ethics. Prentice-Hall.
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