APA (7th ed.) Citation

United States. Forest Service. (1943). Yellow poplar (Liriodendron tulipfera). [s.n.].

Chicago Style (17th ed.) Citation

United States. Forest Service. Yellow Poplar (Liriodendron Tulipfera). [Washington]: [s.n.], 1943.

MLA (9th ed.) Citation

United States. Forest Service. Yellow Poplar (Liriodendron Tulipfera). [s.n.], 1943.

Warning: These citations may not always be 100% accurate.