1. Soils: their implications to human health;Abrahams;Sci. Total Environ.,2002
2. AGVISE, n.d. Interpreting a soil test report. Benson Available at: https://www.agvise.com/wp-content/uploads/2012/07/Interrpreting-a-Soil-Test-Report-high-res.pdf.
3. Soil-plant-animal and human interrelationships in trace element nutrition;Allaway,1986
4. Vanadium—An element both essential and toxic to plants, animals and humans?;Anke;An. de la Real Acad. Nac. de Farm.,2004
5. The essentiality of certain elements in minute quantity for plants with special reference to copper;Arnon;Plant Physiol.,1939