APA-referens (7:e uppl.)

Wolff, H. W. (1918). The future of our agriculture. P.S. King & Son.

Chicago-referens (17:e uppl.)

Wolff, Henry W. The Future of Our Agriculture. London: P.S. King & Son, 1918.

MLA-referens (8:e uppl.)

Wolff, Henry W. The Future of Our Agriculture. P.S. King & Son, 1918.