1. A Primer of Electrocardiography;Burch,1949
2. Electrocardiography in Practice;Graybiel,1952
3. Essentials of Electrocardiography;Ashman,1947
4. Modern Electrocardiography;Lepeschkin,1951
5. Low-voltage T Waves in Electrocardiogram;Master;Am. J. M. Sc.,1931