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Middleton, D. (2011, February 23). National Park System in America. Grove Art Online. Retrieved 5 Dec. 2019, from https://www.oxfordartonline.com/groveart/view/10.1093/gao/9781884446054.001.0001/oao-9781884446054-e-7002090578.
Middleton, Deborah A. "National Park System in America." Grove Art Online. February 23, 2011. Oxford University Press. Date of access 5 Dec. 2019, <https://www.oxfordartonline.com/groveart/view/10.1093/gao/9781884446054.001.0001/oao-9781884446054-e-7002090578>
Middleton, Deborah A. "National Park System in America." Grove Art Online. 23 Feb. 2011; Accessed 5 Dec. 2019. https://www.oxfordartonline.com/groveart/view/10.1093/gao/9781884446054.001.0001/oao-9781884446054-e-7002090578.