Akbar, Son, and Anton Yudhana. 2016. “PROTOTYPE OF TUBE OF LIQUID FERTILIZER BASED QUADCOPTER RIDES FOR RICE LAND PAD”. Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) 3 (2), 26-30. https://doi.org/10.33019/ecotipe.v3i2.22.