Bush, H. K. (2007). Mark Twain and the spiritual crisis of his age. University of Alabama Press.
Tohutoru Kātū Chicago (17th ed.)Bush, Harold K. Mark Twain and the Spiritual Crisis of His Age. Tuscaloosa: University of Alabama Press, 2007.
Tohutoro MLA (9th ed.)Bush, Harold K. Mark Twain and the Spiritual Crisis of His Age. University of Alabama Press, 2007.
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