1. Prof. Inocencio E. Buot (University of the Philippines Los Banos) [PDF]
2. Prof Dr Badrul Munir Md Zain (Department of Biological Sciences and Biotechnology Faculty of Science and Technology Universiti Kebangsaan Malaysia) [PDF]
3. Dr. Joko Ridho Witono M.Si (Research Center for Plant Conservation and Botanic Gardens Indonesian Institute of Sciences) [PDF]