Dr. Kala Devi Ramahsamy. “Oil Palm Waste - Sewage Sludge Compost As A Peat Substitute In A Soilless Potting Media for Chrysanthemum”. Global Journal of Science Frontier Research 12, no. D2 (January 15, 2012): 35–44. Accessed May 4, 2024. https://journalofscience.org/index.php/GJSFR/article/view/487.