APA (7th ed.) Citation

Tracy, W. W. (1904). American varieties of lettuce. Government Printing Office.

Chicago Style (17th ed.) Citation

Tracy, W. W. American Varieties of Lettuce. Washington, D.C.: Government Printing Office, 1904.

MLA (9th ed.) Citation

Tracy, W. W. American Varieties of Lettuce. Government Printing Office, 1904.