Buranakarl, C., S. Sawangkoon, A. Kijtawornrat, and T. Phakhawambodee. “ECG Quiz”. The Thai Journal of Veterinary Medicine, vol. 43, no. 3, Oct. 2013, pp. 461-2, https://he01.tci-thaijo.org/index.php/tjvm/article/view/12285.