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  1.  9
    Robert Z. Apostol (1972). "The Tyranny of Concepts: A Critique of Marxism," Rev. Ed., by Gordon Leff. Modern Schoolman 49 (3):273-275.
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  2.  7
    Robert Z. Apostol (1977). The Philosophy of Urban Existence. International Philosophical Quarterly 17 (1):114-115.
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  3.  19
    Robert Z. Apostol (1974). Sartre. International Philosophical Quarterly 14 (1):129-131.
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  4.  8
    Robert Z. Apostol (1980). Ethics, Free Enterprise, and Public Policy. International Philosophical Quarterly 20 (2):238-240.
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  5.  6
    Robert Z. Apostol (1967). Nature, History, and Existentialism. International Philosophical Quarterly 7 (2):357-358.
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  6. Robert Z. Apostol (ed.) (1970/1971). Human Values in a Secular World. New York,Humanities Press.
     
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