APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Tracy, W. W., Jr. American Varieties of Lettuce. [Washington, D.C.]: U.S. Government Printing Office, 1904.

MLA (9th ed.) Citation

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