Khaehanchanpong, Y., S. Sngiamphongse, P. Suttiwaree, and A. Senanarong. “Spring Chisel Oil Palm (Elaeis guineensis Jacq) Bunch Harvester”. Thai Agricultural Research Journal, vol. 28, no. 3, Dec. 2010, p. 297, doi:10.14456/thaidoa-agres.2010.20.