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Wilson RD, Wilson RD, Audibert F, Brock JA, Carroll J, Cartier L, et al. (jun 2015). „Pre-conception Folic Acid and Multivitamin Supplementation for the Primary and Secondary Prevention of Neural Tube Defects and Other Folic Acid-Sensitive Congenital Anomalies”. Journal of Obstetrics and Gynaecology Canada. 37 (6): 534—52. PMID26334606. doi:10.1016/s1701-2163(15)30230-9.
Maton, Anthea; Jean Hopkins; Charles William McLaughlin; Susan Johnson; Maryanna Quon Warner; David LaHart; Wright, Jill D. (1993). Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall. ISBN978-0-13-981176-0. OCLC32308337.