References
^ Crossley, John C.; Jamieson, Lynn M.; Brayley, Russell E. (2015). Introduction to Commercial Recreation and Tourism : An Entrepreneurial Approach, Sagamore Pub Llc. BiggerBooks. ISBN 9781571676771 (revised Nov 2023)^ (2013). Introduction to Commercial Recreation and Tourism : An Entrepreneurial Approach ECampus. ISBN 9781571676771 (revised Feb 2023)
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