Dey, A. B.; Stout, N. R.; Kenny, R. A. (1997). „Cardiovascular syncope is the most common cause of drop attacks in the elderly.”. Pacing Clin Electrophysiol. 20 (3): 818—819. PMID9080517. doi:10.1111/j.1540-8159.1997.tb03911.x.
Lee H, Yi HA, Lee SR, Ahn BH, Park BR. (2005). „Drop attacks in elderly patients secondary to otologic causes with Meniere's syndrome or non-Meniere peripheral vestibulopathy.”. J Neurol Sci. 232 (1–2): 71—6. PMID15850585. doi:10.1016/j.jns.2005.01.012.CS1 одржавање: Вишеструка имена: списак аутора (веза).
Dey, A. B.; Stout, N. R.; Kenny, R. A. (1997). „Cardiovascular syncope is the most common cause of drop attacks in the elderly.”. Pacing Clin Electrophysiol. 20 (3): 818—819. PMID9080517. doi:10.1111/j.1540-8159.1997.tb03911.x.
Lee H, Yi HA, Lee SR, Ahn BH, Park BR. (2005). „Drop attacks in elderly patients secondary to otologic causes with Meniere's syndrome or non-Meniere peripheral vestibulopathy.”. J Neurol Sci. 232 (1–2): 71—6. PMID15850585. doi:10.1016/j.jns.2005.01.012.CS1 одржавање: Вишеструка имена: списак аутора (веза).