1. “Guide to Drilling, Workover and Completion Fluids”;Wright;World Oil,1978
2. Oil and Gas Well Drilling Fluid Chemicals, API Bull. 13 F, First edition, (Nov., 1977), American Petroleum Institute, Dallas.
3. U.S. Bureau of Mines, Clay in 1977 (July 14, 1978); ‘Barite in 1977,” (Sept. 21, 1978).
4. “Chemicals in Drilling and Production Operations”;Robinson;API Drill. Prod. Prac.,1940
5. “Drilling Fluids”;Gray,1957