Zahnen, P. N. (1949). Philosophia moralis: Seu ethica (4 ed.). [s.n.].
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Dyfyniad Arddull Chicago
Zahnen, Petro N. Philosophia Moralis: Seu Ethica. 4 ed. Sancti Leopoldi (RS): [s.n.], 1949.
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Dyfyniad MLA
Zahnen, Petro N. Philosophia Moralis: Seu Ethica. 4 ed. [s.n.], 1949.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.