APA
(1969). Rubber Growers' Seminar, Thiruvananthapuram. Kottayam: Rubber Research Institute of India.
Chicago
1969. Rubber Growers' Seminar, Thiruvananthapuram. Kottayam: Rubber Research Institute of India.
Harvard
(1969). Rubber Growers' Seminar, Thiruvananthapuram. Kottayam: Rubber Research Institute of India.
MLA
Rubber Growers' Seminar, Thiruvananthapuram. Kottayam: Rubber Research Institute of India. 1969.