Wahyuni, Elly, et al. “Deep Back Massage Effect on the Reduction of Active Phase 1 Labor Pain at the Curup Public Hospital Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 42, no. 4, Nov. 2018, pp. 1-7, https://gssrr.org/JournalOfBasicAndApplied/article/view/9456.