References
^ Robert S. OgilvieVoluntarism, Community Life, and the American Ethic by Robert S. Ogilvie (2004, Hardcover) ISBN 9780253344236 (revised Feb 2023)^ Ogilvie, Robert S. (2014). Voluntarism, Community Life, and the American Ethic, Indiana Univ Pr. BiggerBooks. ISBN 9780253344236 (revised Jul 2024)
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