APA (7th ed.) Citation

Twed, W. C. (1980). Recreation site planning and improvement in national forests: 1891 - 1942. US of Agriculture Forest Service.

Chicago Style (17th ed.) Citation

Twed, William C. Recreation Site Planning and Improvement in National Forests: 1891 - 1942. Washington, DC: US of Agriculture Forest Service, 1980.

MLA (9th ed.) Citation

Twed, William C. Recreation Site Planning and Improvement in National Forests: 1891 - 1942. US of Agriculture Forest Service, 1980.