1. https://en.wikipedia.org/wiki/Iran
2. https://fanack.com/iran/population/
3. Historical Background of the Ministry of Health in Iran http://ird.behdasht.gov .ir/page/http-c-o-l-o- n-ird.behdasht.gov.irportalribbon.aspx
4. Iran Statistics’ Center(In Persian) https://www.amar.org.ir/news/ID/5564/%D8%AA%D8%B9%D8%AF%D8% A7%D8%AF-954-%D8%A8%DB%8C%D9%85%D8% A7%D8%B1%D8%B3%D8%AA% D8%A7%D9%86-%D9%81%D8%B9%D8%A7%D9%84-%D8%AF%D8%B1-%DA%A9%D8%B4% D9%88%D8%B1-%D9%88%D8%AC%D9%88%D8% AF-%D8%AF%D8%A7%D8%B1%D8%AF
5. Sleep Medicine Standards(In Persian) http://vct.qums.ac.ir/Portal/home/?news/455295/836691/836706/%D8%A7%D8%B3%D8%AA%D8%A7%D9%86%D8%AF%D8%A7%D8%B1%D8%AF%D9%87%D8%A7%DB%8C-%D9%BE%D8%B2%D8%B4%DA%A9%DB%8C-%D8%AE%D9%88%D8%A7%D8%A8