Beaumont, J. H. (1981). A hand-operated winnower. Tropical Products Institute.
Cita Chicago (17th ed.)Beaumont, J H. A Hand-operated Winnower. London: Tropical Products Institute, 1981.
Cita MLA (8th ed.)Beaumont, J H. A Hand-operated Winnower. Tropical Products Institute, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.