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Lua i Stíl Chicago (17ú heag.)Joint Committee on Recreational Survey of Federal Lands, American Forestry Association, National Parks Association (U.S.), National Conference on Outdoor Recreation, agus William Pickman Wharton. Recreation Resources of Federal Lands: Report of the Joint Committee on Recreational Survey of Federal Lands of the American Forestry Association and the National Parks Association to the National Conference on Outdoor Recreation. Washington: National Conference on Outdoor Recreation, 1928.
Lua MLA (8ú heag.)Joint Committee on Recreational Survey of Federal Lands, et al. Recreation Resources of Federal Lands: Report of the Joint Committee on Recreational Survey of Federal Lands of the American Forestry Association and the National Parks Association to the National Conference on Outdoor Recreation. National Conference on Outdoor Recreation, 1928.