Não informado. (2001). Annual Review. Rubber Research Institute of Sri Lanka.
Chicagoスタイル(17版)引用形式Não informado. Annual Review. Colombo: Rubber Research Institute of Sri Lanka, 2001.
MLA(8版)引用形式Não informado. Annual Review. Rubber Research Institute of Sri Lanka, 2001.
警告: この引用は必ずしも正確ではありません.