Smedts HP, de Vries JH, Rakhshandehroo M, et al. (febrero de 2009). «High maternal vitamin E intake by diet or supplements is associated with congenital heart defects in the offspring». BJOG116 (3): 416-23. PMID19187374. doi:10.1111/j.1471-0528.2008.01957.x.
Saris, W. E.; Revilla, M. (2015). «Correction for measurement errors in survey research: necessary and possible». Social Indicators Research127: 1005-1020. doi:10.1007/s11205-015-1002-x.
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Smedts HP, de Vries JH, Rakhshandehroo M, et al. (febrero de 2009). «High maternal vitamin E intake by diet or supplements is associated with congenital heart defects in the offspring». BJOG116 (3): 416-23. PMID19187374. doi:10.1111/j.1471-0528.2008.01957.x.