Joint Committee on Recreational Survey of Federal Lands, American Forestry Association, National Parks Association (U.S.), National Conference on Outdoor Recreation, & Wharton, W. P. (1928). 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.
Παραπομπή σε μορφή Chicago (17η εκδ.)Joint Committee on Recreational Survey of Federal Lands, American Forestry Association, National Parks Association (U.S.), National Conference on Outdoor Recreation, και 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.
Παραπομπή σε μορφή MLA (8th εκδ.)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.