1. Tuberculin Surveys with Purified Protein Derivative; Determination of Optimum Dosage;Long E. R.;American Review of Tuberculosis,1934
2. J. D.Aronson: “Purified Protein Derivative with Special Reference to Technique of Tuberculin Injections and Grading of Reactions” loco citato page727.
3. P. D'A.Hart: “The Value of Tuberculin Tests in Man with Special Reference to the Intracutaneous Test” Medical Research Council of the Privy Council Special Report Series Number 168 1932 page126.