1. “A short note on the kaolin deposits near Darugiri, Garo hills, Meghalaya,” received from the Directorate of Mineral Resources, Govt. of Meghalaya (1972).
2. “Indian Standard Methods of Sampling and Testing of Refractories Materials,” IS: 484 (1953), ISI, New Delhi.
3. “Indian Standard Specification for Light Kaolin,” IS: 505–1968, ISI, New Delhi.
4. A ST M Standards, Part III, pp. 779–861, 1326–28, 1756–68 and 1769–76, American Society of Testing Materials, Philadelphia, Pa, USA (1955).