Wolff, H. W. (1918). The future of our agriculture. P.S. King & Son.
Lua i Stíl Chicago (17ú heag.)Wolff, Henry W. The Future of Our Agriculture. London: P.S. King & Son, 1918.
Lua MLA (8ú heag.)Wolff, Henry W. The Future of Our Agriculture. P.S. King & Son, 1918.
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