Oku , Effiom, Ambrose Aiyelari, Olajire Fagbola, and Ayuk Essoka. 2012. “Vetiver Seedlings Multiplication in Rice Husk Amended Soil and Crops Performance on Erosion-Prone Hillside under Vetiver Buffer Strips”. Agriculture and Natural Resources 46 (2). Bangkok, Thailand:238-55. https://li01.tci-thaijo.org/index.php/anres/article/view/242826.