Piper, J. (2007). Don't waste your time. Crossway Books.
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Chicago-čujuhus (17. p.)
Piper, John. Don't Waste Your Time. Wheaton, Ill.: Crossway Books, 2007.
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MLA-čujuhus (9. p.)
Piper, John. Don't Waste Your Time. Crossway Books, 2007.
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