M.B. Areza-Ubaldo, S.S. Magat, E.P. Rillo, and M.I. Secretaria, “Crop nutrition and fertilizer management of embryo-cultured seedlings of Makapuno and Laguna Tall coconuts with special reference to their response to different levels of NaCl and chicken manure”, CORD, vol. 22, no. 2, p. 14, Apr. 2006.