1. Brown , C. C. 1893 Fourth Report on Mohawk and Hudson Rivers 13th Annual Report of the State Board of Health of New York for 1892 680
2. Prescott , S. C. Winslow , C-E. A. 1931 Elements of Water Analysis 5th edition
3. Jackson , D. D. 1906 A New Solution for the Presumptive Test for B. coli Biological Studies by the Pupils of William Thompson Sedgwick Boston
4. The Value of the Esculin Test;Hale;Jour. A. P. H. A.,1911
5. The Elimination of Spurious Presumptive Tests for B. coli in Water by the Use of Gentian Violet;Hall;J. Bact.,1918