APA (7th ed.) Citation

United States. Food Safety and Quality Service. (1977). How to buy a Christmas tree (Slightly rev. Oct. 1977.). Dept. of Agriculture, Food Safety and Quality Service.

Chicago Style (17th ed.) Citation

United States. Food Safety and Quality Service. How to Buy a Christmas Tree. Slightly rev. Oct. 1977. [Washington]: Dept. of Agriculture, Food Safety and Quality Service, 1977.

MLA (9th ed.) Citation

United States. Food Safety and Quality Service. How to Buy a Christmas Tree. Slightly rev. Oct. 1977. Dept. of Agriculture, Food Safety and Quality Service, 1977.