APA
(1969). Rubber Karshaka Seminar, 4 June 1969, Thiruvananthapuram, India. Kottayam: Rubber Research Institute of India.
Chicago
1969. Rubber Karshaka Seminar, 4 June 1969, Thiruvananthapuram, India. Kottayam: Rubber Research Institute of India.
Harvard
(1969). Rubber Karshaka Seminar, 4 June 1969, Thiruvananthapuram, India. Kottayam: Rubber Research Institute of India.
MLA
Rubber Karshaka Seminar, 4 June 1969, Thiruvananthapuram, India. Kottayam: Rubber Research Institute of India. 1969.
