References
^ Robert V. Kail, John C. CavanaughHuman Development : A Life-Span View by John C. Cavanaugh and Robert V. Kail (2012, Hardcover) ISBN 9781111834111 (revised Aug 2015)^ Kail, Robert V.; Cavanaugh, John C. (2014). Human Development : A Life-Span View, Cengage Learning. BiggerBooks. ISBN 9781111834111 (revised Feb 2024)
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