S. Febrila, N. Suharto, and L. D. Mustafa, “On the Design of a Website-Based Self Service Laundry Schedule Ordering System Using the MQTT Protocol Rancang Bangun Sistem Pemesanan Jadwal Laundry Self Service Berbasis Website Menggunakan Protokol MQTT”, Jartel, vol. 10, no. 4, pp. 207-212, Dec. 2020.