APA (7th ed.) Citation

Zwickel, E. M. (1923). German agricultural implement industry and trade. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Zwickel, Ernest M. German Agricultural Implement Industry and Trade. [Washington?]: U.S. Government Printing Office, 1923.

MLA (9th ed.) Citation

Zwickel, Ernest M. German Agricultural Implement Industry and Trade. U.S. Government Printing Office, 1923.