1. Drugs.com. Acetaminophen. Aug 2017. Available from: https://www.drugs.com/acetaminophen.html
7. Kementerian Kesehatan R.I. Daftar Obat Esensial Nasional 2013. 2014; Available from: http://binfar.kemkes.go.id/2014/02/daftar-obat-esensial-nasional-2013/#.WM-TUbVMRjo.
8. WHO. Essential medicines. 2017; Available from: http://www.who.int/medicines/services/essmedicines_def/en/.
9. NHS.uk. Paracetamol. May 2016. Available from: https://www.nhs.uk/conditions/paracetamol/
10. Pergolizzi JV, Laar MVD, Langford R, Mellinghoff HU, Merchante IM, Nalamachu S, et al. Tramadol/paracetamol fixed-dose combination in the treatment of moderate to severe pain. J Pain Res. 2012; 5: 327-346
11. Derry CJ, Derry S, Moore RA. Single dose oral ibuprofen plus paracetamol (acetaminophen) for acute postoperative pain. Cochrane Database Syst Revi 2013.
12. Doherty M, Hawkey C, Goulder M, et al. A randomised controlled trial of ibuprofen, paracetamol or a combination tablet of ibuprofen/paracetamol in community-derived people with knee pain. Ann Rheum Dis. 2011;70:1534-41.
13. WHO collaborating centre for drug statistics methodology. List of DDDs combined products. Aug 2018. Available from: https://www.whocc.no/ddd/list_of_ddds_combined_products/