APA
Yogaratnam N, De Mel J G, . (1985). Effect of fertilizers on leaf composition of NPK in some Hevea cultivars. : Journal of the Rubber Research Institute of Sri Lanka.
Chicago
Yogaratnam N, De Mel J G, . 1985. Effect of fertilizers on leaf composition of NPK in some Hevea cultivars. : Journal of the Rubber Research Institute of Sri Lanka.
Harvard
Yogaratnam N, De Mel J G, . (1985). Effect of fertilizers on leaf composition of NPK in some Hevea cultivars. : Journal of the Rubber Research Institute of Sri Lanka.
MLA
Yogaratnam N, De Mel J G, . Effect of fertilizers on leaf composition of NPK in some Hevea cultivars. : Journal of the Rubber Research Institute of Sri Lanka. 1985.