APA
(1975). Directory of Rubber Estates and Holdings, Trivandrum & Quilon District. Kottayam: Rubber Research Institute of India.
Chicago
1975. Directory of Rubber Estates and Holdings, Trivandrum & Quilon District. Kottayam: Rubber Research Institute of India.
Harvard
(1975). Directory of Rubber Estates and Holdings, Trivandrum & Quilon District. Kottayam: Rubber Research Institute of India.
MLA
Directory of Rubber Estates and Holdings, Trivandrum & Quilon District. Kottayam: Rubber Research Institute of India. 1975.
