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Whitrow et al. Effect of Supplemental Folic Acid in Pregnancy on Childhood Asthma: A Prospective Birth Cohort Study. „American Journal of Epidemiology”. 170 (12), s. 1486–1493, 2009. DOI: 10.1093/aje/kwp315. PMID: 19880541.
Mulinare J, Cordero JF, Erickson JD, Berry RJ. Periconceptional use of multivitamins and the occurrence of neural tube defects. „JAMA”. 260 (21), 1988. DOI: 10.1001/jama.1988.03410210053035. PMID: 3184392.
Whitrow et al. Effect of Supplemental Folic Acid in Pregnancy on Childhood Asthma: A Prospective Birth Cohort Study. „American Journal of Epidemiology”. 170 (12), s. 1486–1493, 2009. DOI: 10.1093/aje/kwp315. PMID: 19880541.