Wheeler, G. (1994). Activity e Sing Book: The Ladder of life series. Review and Herald Publishing Association.
Cita Chicago (17th ed.)Wheeler, Gerald. Activity E Sing Book: The Ladder of Life Series. Hagerstow, MD: Review and Herald Publishing Association, 1994.
Cita MLA (9th ed.)Wheeler, Gerald. Activity E Sing Book: The Ladder of Life Series. Review and Herald Publishing Association, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.