S.Gopakumar, and K.Gopikumar. “STANDARDISATION OF CONTAINERS FOR GROWTH AND VIGOUR OF TREE SEEDLINGS IN THE NURSERY”. Journal of Tropical Forest Science (JTFS), vol. 6, no. 1, Sept. 1993, pp. 26-36, https://jtfs.frim.gov.my/jtfs/article/view/1866.