Tohutoro APA (7th ed.)
Paulsen, F. (1899). System of ethics. Charles Scribner.
Tohutoru Kātū Chicago (17th ed.)
Paulsen, Friedrich. System of Ethics. New York: Charles Scribner, 1899.
Tohutoro MLA (9th ed.)
Paulsen, Friedrich. System of Ethics. Charles Scribner, 1899.
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