Wheeler, G. (1994). Activity e Sing Book: The Ladder of life series. Review and Herald Publishing Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWheeler, Gerald. Activity E Sing Book: The Ladder of Life Series. Hagerstow, MD: Review and Herald Publishing Association, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWheeler, Gerald. Activity E Sing Book: The Ladder of Life Series. Review and Herald Publishing Association, 1994.
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