APA
Yogaratnam N, De Mel G, . (1987). Eppawela rock phosphate as a source of phosphorus for rubber. : Bulletin of the Rubber Research Institute of Sri Lanka.
Chicago
Yogaratnam N, De Mel G, . 1987. Eppawela rock phosphate as a source of phosphorus for rubber. : Bulletin of the Rubber Research Institute of Sri Lanka.
Harvard
Yogaratnam N, De Mel G, . (1987). Eppawela rock phosphate as a source of phosphorus for rubber. : Bulletin of the Rubber Research Institute of Sri Lanka.
MLA
Yogaratnam N, De Mel G, . Eppawela rock phosphate as a source of phosphorus for rubber. : Bulletin of the Rubber Research Institute of Sri Lanka. 1987.