Não informado. (1976). Journal of the Rubber Research Institute of Sri Lanka. Rubber Research Institute of Sri Lanka.
Čikaški stil citiranja (17. izdanje)Não informado. Journal of the Rubber Research Institute of Sri Lanka. Agalawatta, Sri Lanka: Rubber Research Institute of Sri Lanka, 1976.
MLA način citiranja (8. izdanje)Não informado. Journal of the Rubber Research Institute of Sri Lanka. Rubber Research Institute of Sri Lanka, 1976.
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