Ballard, E. G. (1971). Philosophy at the crossroads. Louisiana State University Press.
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Chicago-čujuhus (17. p.)
Ballard, Edward G. Philosophy at the Crossroads. Baton Rouge: Louisiana State University Press, 1971.
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MLA-čujuhus (9. p.)
Ballard, Edward G. Philosophy at the Crossroads. Louisiana State University Press, 1971.
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