Astuti, Siti Choirul Dwi, and Riana Trinovita Sari. “The Effect of Using Endorphin Massage for Decreasing Pain at First Stage in Normal Labor ”. JURNAL INFO KESEHATAN, vol. 20, no. 2, Dec. 2022, pp. 194-05, doi:10.31965/infokes.Vol20.Iss2.877.