Francis, S. E., A. B. Y. Christophe, T. D. Charlotte, and O. Samuel. “Production Systems to Minimize the Latex Harvesting Cost of Rubber (Hevea Brasiliensis)”. European Scientific Journal, ESJ, Vol. 14, no. 30, Oct. 2018, p. 190, doi:10.19044/esj.2018.v14n30p190.