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Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd. Rahim, Anuar and Musa, Mohamed Hanafi and De Silva, Angela Ee (2005) A modified way of producing humic acid from composted pineapple leaves. Journal of Sustainable Agriculture, 25 (1). pp. 129-139. ISSN 1044-0046

Yasin, Yamin and Abdul Malek, Abdul Hafiz and Ahmad, Faujan (2010) Response surface methodology study on removal of humic acid from aqueous solutions using anionic clay hydritalcytes. Journal of Applied Sciences, 10 (19). pp. 2297-2303. ISSN 1812-5654