Radhakrishnan TP & Prasannakumari Amma S(Guide). (1997). Impact of trading companies jointly sponsored by rubber board and Rubber Producers societies on growers in Kottayam and Thrissur Districts. Department of Plantation Crops and Spices, College of Hrticulture.

Radhakrishnan TP a Prasannakumari Amma S(Guide). Impact of Trading Companies Jointly Sponsored by Rubber Board and Rubber Producers Societies on Growers in Kottayam and Thrissur Districts. Vellanikkara: Department of Plantation Crops and Spices, College of Hrticulture, 1997.

Radhakrishnan TP a Prasannakumari Amma S(Guide). Impact of Trading Companies Jointly Sponsored by Rubber Board and Rubber Producers Societies on Growers in Kottayam and Thrissur Districts. Department of Plantation Crops and Spices, College of Hrticulture, 1997.