المؤلفات التي استمددت منها روح هذا الكتاب
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(1)
MANUAL OF ETHICS, By John S. Mackenzie M.A.Prof. Of Philosophy in the University of South Wales
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(2)
The ELEMENTS OF ETHICS, By John H.Muirhead L.L.D.Prof. Of mental and moral Philosophy in the University of Birmingham.
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(3)
TOPICS OF ETHICAL THEORY, By James Martineau D. D, S.T.D, D.E.L.L.L.D.Late Principal of Manchester New College. London.
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(4)
THE THEORY OF ETHICS, By Arthur Kenym Rogers.
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(5)
THE FACTS OF THE MORAL LIFE, By Wilhelm Wandt.Prof. of Philosophy in the University of Leipzing.
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(6)
PRINCIPAL OF ETHICS, By Borden P. Bowne.Prof. of Philosophy in Boston University.
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(7)
THE ETHICS OF PROGRESS, By Charles F. Dole.Prof. at Harvard University.