APA (7th ed.) Citation

United States. State and Private Forestry. Cooperative Forestry & United States. Forest Service. Directory of forest tree seed orchards in the United States. The Service.

Chicago Style (17th ed.) Citation

United States. State and Private Forestry. Cooperative Forestry and United States. Forest Service. Directory of Forest Tree Seed Orchards in the United States. [Washington, D.C.?]: The Service.

MLA (9th ed.) Citation

United States. State and Private Forestry. Cooperative Forestry and United States. Forest Service. Directory of Forest Tree Seed Orchards in the United States. The Service.