1. Essentials of Electrocardiography for the Student and Practitioner of Medicine;Ashman,1941
2. The Normal Electrocardiogram;Chamberlain;Brit. Heart J.,1939
3. The Interpretation of the Normal Electrocardiogram: a Critical and Experimental Study;Eyster;Arch. Int. Med.,1913
4. A Study of 2,400 Electrocardiograms of Apparently Healthy Males;Johnson;J. A M. A.,1940
5. Heart Disease;White,1943