Inside Health 3/10/18- fertility awareness methods of contraception

https://www.tandfonline.com/doi/full/10.3109/13625187.2016.1154143

https://www.fsrh.org/news/fsrh-fpa-and-fertilityuk-call-for-more-independent-research-on/

https://journals.lww.com/greenjournal/Fulltext/2018/09000/Effectiveness_of_Fertility_Awareness_Based_Methods.8.aspx

https://www.asa.org.uk/rulings/naturalcycles-nordic-ab-sweden-a17-393896.html- N

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