Pacemaker malfunction.

MLA

Hayes, D. L., and R. E. Vlietstra. “Pacemaker Malfunction.” Annals of Internal Medicine, vol. 119, no. 8, Oct. 1993, pp. 828–35. EBSCOhost, https://doi.org/10.7326/0003-4819-119-8-199310150-00009.

APA

Hayes, D. L., & Vlietstra, R. E. (1993). Pacemaker malfunction. Annals of Internal Medicine, 119(8), 828–835. https://doi.org/10.7326/0003-4819-119-8-199310150-00009

Chicago

Hayes, D L, and R E Vlietstra. 1993. “Pacemaker Malfunction.” Annals of Internal Medicine 119 (8): 828–35. doi:10.7326/0003-4819-119-8-199310150-00009.