Harkness, A., Ring, L., Augustine, D. X., Oxborough, D., Robinson, S., & Sharma, V. (2020, February). Normal reference intervals for cardiac dimensions and function for use in echocardiographic practice: A guideline from the British Society of Echocardiography. Echo Research and Practice.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Harkness, Allan, Liam Ring, Daniel X. Augustine, David Oxborough, Shaun Robinson, و Vishal Sharma. "Normal Reference Intervals for Cardiac Dimensions and Function for Use in Echocardiographic Practice: A Guideline from the British Society of Echocardiography." Echo Research and Practice Feb. 2020.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Harkness, Allan, et al. "Normal Reference Intervals for Cardiac Dimensions and Function for Use in Echocardiographic Practice: A Guideline from the British Society of Echocardiography." Echo Research and Practice, Feb. 2020.