1. National Institutes of Health. (2014). The effect of lemon inhalation aromatherapy on nausea and vomiting of pregnancy

https://www.ncbi.nlm.nih.gov/pubmed/24829772

2. National Institutes of Health. (2000) From Neurons to Neighborhoods: The Science of Early Childhood Development.. Retrieved from: https://www.ncbi.nlm.nih.gov/books/NBK225562/

3. National Institutes of Health. (2012). Benefits of Docosahexaenoic Acid, Folic Acid, Vitamin D and Iodine on Foetal and Infant Brain Development.

Retrieved from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3407995/

4. World Health Organisation. (2001). Healthy Eating during Pregnancy and Breastfeeding, 20. Retrieved from: http://www.euro.who.int/__data/assets/pdf_file/0020/120296/E73182.pdf