NWAOGUALA, C. N. C., and H. O. SHITTU. “Effects of Growth Regulators and Type-Variety of Oil Palm (Elaeis Guineensis Jacq.) on Direct Organogenesis”. Notulae Scientia Biologicae, vol. 10, no. 2, June 2018, pp. 251-8, doi:10.15835/nsb10210234.