Ortberg, J. (2001). If you want to walk on water, you've got to get out of the boat. Zondervan Pub. House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOrtberg, John. If You Want to Walk on Water, You've Got to Get Out of the Boat. Grand Rapids, Mich.: Zondervan Pub. House, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOrtberg, John. If You Want to Walk on Water, You've Got to Get Out of the Boat. Zondervan Pub. House, 2001.
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