1. Essentials of Electrocardiography;Ashman,1945
2. Special Report;Committee of the American Heart Association on the Standardization of Electrocardiographic Nomenclature;Am. Heart J.,1943
3. Some Supplementary Leads in Clinical Electrocardiography;Grewin;Acta med. Scandinav. Suppl.,1948
4. Klinische Elecktrokardiographie;Holzmann,1947
5. Electrocardiography;Katz,1947