Schuller, R. H. (1988). Success is never ending, failure is never final. T. Nelson Publishers, Bantam Books.
Chicago-viite (17. p.)Schuller, Robert H. Success Is Never Ending, Failure Is Never Final. Nashville : New York: T. Nelson Publishers, Bantam Books, 1988.
MLA-viite (8. p.)Schuller, Robert H. Success Is Never Ending, Failure Is Never Final. T. Nelson Publishers, Bantam Books, 1988.
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