Summerall, C. P. (1985). Lessons in EKG interpretation: A basic self-instruction guide. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Summerall, Charles P. Lessons in EKG Interpretation: A Basic Self-instruction Guide. John Wiley and Sons, 1985.
Lua MLA (9ú heag.)Summerall, Charles P. Lessons in EKG Interpretation: A Basic Self-instruction Guide. John Wiley and Sons, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.