Bahrizal, A. R., and M. Meiyanti. “Association Between Heel-Height and Low Back Pain in Sales Promotion Girls”. JKKI : Jurnal Kedokteran Dan Kesehatan Indonesia, vol. 8, no. 3, Dec. 2017, pp. 198-04, doi:10.20885/JKKI.Vol8.Iss3.art9.