Footnote 2. von Wandruszka R., Humic acids: Their detergent qualities and potential uses in pollution remediation, Geochemical Transactions, 2 (2000), The Royal Society of Chemistry and the Division of Geochemistry of the American Chemical Society, https://geochemicaltransactions.springeropen.com/articles/10.1186/1467-4866-1-10

Additional Resources

4.   International Humic Substances Society (IHSS), http://www.humicsubstances.org/

5.    Pettit, R. E. Organic matter, humus, humate, humic acid, fulvic acid and humin: Their importance in soil fertility and plant health, http://www.humates.com/pdf/ORGANICMATTERPettit.pdf