Guarneri, Julia (January 2012). "Changing Strategies for Child Welfare, Enduring Beliefs about Childhood: The Fresh Air Fund, 1877–1926." Journal of the Gilded Age and Progressive Era. Vol. 11, issue 1, pp. 27–70; here: p. 28. doi: 10.1017/S1537781411000454. Retrieved via Proquest Research Library database, 2017-07-04.