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Ahmad Zuhaidi Yahya, . and Zakaria Ibrahim, . and Rosdi Koter, . (2002) Species for timber plantations. In: A manual for forest plantation establishment in Malaysia. Forest Research Institute Malaysia (FRIM), Kuala Lumpur Malaysia, pp. 13-24. ISBN 983-2181-28-3
Ismariah A., . and Norini H., . and Lokmal N.M., . and Zakaria Ibrahim, . (1999) Economics of planting rubber as forest plantations. In: Rubberwood processing and utilisation. Forest Research Institute Malaysia (FRIM), Kuala Lumpur Malaysia, pp. 227-236. ISBN 983-9592-27-0
Mohamad Lokmal Hj Ngah, . and Ab Rasip Ab Ghani, . and Zakaria Ibrahim, . and Ong T.H., . Heritability of total height and diameter growth for seven year old Gmelina arborea. pp. 73-78. ISSN 0126-8643