Avery O. T., MacLeod C.M., McCarty M. Studies on the Chemical Nature of the Substance Inducing Transformation of Pneumococcal Types – Induction of Transformation by a Desoxyribonucleic Acid Fraction Isolated from Pneumococcus Type III (PDF) // Journal of Experimental Medicine. February 1, 1944; 79 (2): 137–158; doi: 10.1084/jem.79.2.137.