John, A. (2007). Neural Tube Defects in the Carmarthenshire LHB area. NPHS. Adferwyd fis Medi 2014
McDonnell, R., Delany, V., O’Mahony, M. T., & Mullan, C. (2014, March 18). Neural tube defects in the Republic of Ireland in 2009–11. Journal of Public Health, (advanced access) pp1-7. Adferwyd 28 Awst, 2014 o http://jpubhealth.oxfordjournals.org