Fernandes Lopes, M., E. de Carvalho Coutinho, M. J. Santos, M. Ferreira, and H. Dias. “Effects of Perineal Massage During Labor”. International Journal of Developmental and Educational Psychology. Revista INFAD De Psicología., vol. 2, no. 1, Aug. 2021, pp. 519-30, doi:10.17060/ijodaep.2021.n1.v2.2132.