1. Hodges , A. L. S. M. Rogers A. H. Harder Gas and brackish water in fresh-water aquifers, Lake Charles area, Louisiana: Louisiana Dept. Conserv. Louisiana Dept. Public Works, Water Resources Pam. 13 1963
2. Handbook of Chemistry and Physics
3. Mine Safety Appliance Company Portable Gas Indicator, Model 40, Response Curves Pittsburgh, Pennsylvania
4. A new method for determining methane in water;Rossum;Am. Water Works Assoc. J.,1950