APA (7th ed.) Citation

United States. Agricultural Research Service. (1974). Azaleas and rhododendrons at the National Arboretum ([Rev. Jan. 1974].). Dept. of Agriculture, Agricultural Research Service.

Chicago Style (17th ed.) Citation

United States. Agricultural Research Service. Azaleas and Rhododendrons at the National Arboretum. [Rev. Jan. 1974]. [Washington]: Dept. of Agriculture, Agricultural Research Service, 1974.

MLA (9th ed.) Citation

United States. Agricultural Research Service. Azaleas and Rhododendrons at the National Arboretum. [Rev. Jan. 1974]. Dept. of Agriculture, Agricultural Research Service, 1974.