Norethindrone Acetate, Oral Drug Information. Facts and Comparisons Retrieved April 29, 2016 from http://online.factsandcomparisons.com/MonoDisp.aspx?monoID=fandc-hcp12277&quick=-242181%7c5&search=-242181%7c5&isstemmed=True&NDCmapping=-1&fromTop=true#firstMatch
Norethindrone Acetate, Oral Prescribing Information. Retrieved April 29,2016 from http://www.accessdata.fda.gov/drugsatfda_docs/label/2007/018405s023lbl.pdf
Norethindrone Acetate, Oral: Drug Information. Daily Med at FDA Retrieved April 29,2016 from https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=69f5bc4b-758d-471b-ad8d-17c94f8e0963&audience=consumer