D. P. Dwi Prasetyo, I. L. Ibrahim Lamada, and W. N. A. Wilma Nurrul Adzillah, “Implementasi Monitoring Kualitas Udara menggunakan Sensor MQ-7 dan MQ-131 berbasis Internet Of Things”, ELC, vol. 15, no. 3, pp. 239-245, Sep. 2021.