Mir Munsif Ali Talpur, Tajnees Pirzada, Waheed Ali, Mohammad Hussain Arain, Samina Rajper, and Mazar Khaskheli, Trans., “Isolation and Characterization of Soil Fulvic Acid”, Pak. J. Anal. Environ. Chem., vol. 17, no. 1, pp. 8 – 17, Jan. 2016, doi: 10.21743/pjaec/2016.06.002.