Rudi Uswarman, and Swadexi Istiqphara. “Perancangan Sistem Kendali Quadcopter Menggunakan Modified Sliding Mode Control”. Jurnal Nasional Teknik Elektro Dan Teknologi Informasi, Vol. 8, no. 3, Aug. 2019, pp. 273-9, https://dev.journal.ugm.ac.id/v3/JNTETI/article/view/2578.