Farias, Leiliane Martins, Rita Maria Viana Rêgo, Francisca Elisângela Teixeira Lima, Thelma Leite de Araújo, Maria Vera Lúcia Moreira Leitão Cardoso, and Ângela Maria Alves e Souza. 2011. “Nursing Care in Newborn Pain Relief: Integrative Review”. Rev Rene 12 (4). http://periodicos.ufc.br/rene/article/view/4361.