Duesa, M. A., and K. R. T. P. Sari. “Monitoring and Notification System Air Quality Against Carbon Monoxide in The Study Room IoT Based”. INTENSIF: Jurnal Ilmiah Penelitian Dan Penerapan Teknologi Sistem Informasi, Vol. 5, no. 1, Feb. 2021, pp. 121-33, doi:10.29407/intensif.v5i1.14844.