Liwang, F., D. Nadobudskaya, I. Lestari, and T. Hendrarto. “Preterm Infant Physiological Responses to Music Therapy: A Systematic Review”. Paediatrica Indonesiana, Vol. 58, no. 5, Oct. 2018, pp. 242-51, doi:10.14238/pi58.5.2018.242-51.