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Papouchado, M.; Walker, P. R.; James, M. A.; Clarke, L. M. (1 July 1987). "Fundamental differences between the standard 12-lead electrocardiograph and the modified (Mason-Likar) exercise lead system". European Heart Journal. 8 (7). Oxford University Press (OUP): 725–733. doi:10.1093/eurheartj/8.7.725. ISSN0195-668X. PMID3653124.
Papouchado, M.; Walker, P. R.; James, M. A.; Clarke, L. M. (1 July 1987). "Fundamental differences between the standard 12-lead electrocardiograph and the modified (Mason-Likar) exercise lead system". European Heart Journal. 8 (7). Oxford University Press (OUP): 725–733. doi:10.1093/eurheartj/8.7.725. ISSN0195-668X. PMID3653124.
"Holter Monitor". www.heart.org. Archived from the original on 16 July 2018. Retrieved 8 April 2018.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
Papouchado, M.; Walker, P. R.; James, M. A.; Clarke, L. M. (1 July 1987). "Fundamental differences between the standard 12-lead electrocardiograph and the modified (Mason-Likar) exercise lead system". European Heart Journal. 8 (7). Oxford University Press (OUP): 725–733. doi:10.1093/eurheartj/8.7.725. ISSN0195-668X. PMID3653124.