Merijanti, L. T., P. Pusparini, M. Meiyanti, A. Alvina, N. I. Sudharma, and M. Tjahjadi. “Heavy Mental Workload Increase Poor Sleep Quality in Informal Garment Workers”. Universa Medicina, vol. 38, no. 3, Dec. 2019, pp. 202-8, doi:10.18051/UnivMed.2019.v38.202-208.