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Whisnant, Anne Mitchell, Marla R. Miller, Gary B. Nash, David Paul Thelen, Organization of American Historians, and United States National Park Service. Imperiled Promise The State of History in the National Park Service, 2011.

Whisnant AM, Miller MR, Nash GB, Thelen DP, Historians OOA, Service USNP. Imperiled Promise The State of History in the National Park Service. 2011.

Whisnant, Anne Mitchell, et al. Imperiled Promise The State of History in the National Park Service. 2011.

Whisnant AM, Miller MR, Nash GB, Thelen DP, Historians OOA, Service USNP. Imperiled Promise The State of History in the National Park Service. 2011.