1. Advanced Circuits. 2018. Printed circuit board (PCB) fabrication. (2018). http://www.4pcb.com/. Advanced Circuits. 2018. Printed circuit board (PCB) fabrication. (2018). http://www.4pcb.com/.
2. AmScope. 2018. 3.5X-90X Circuit Zoom Stereo Microscope (SM-4TZ-144). (2018). http://www.amscope.com/. AmScope. 2018. 3.5X-90X Circuit Zoom Stereo Microscope (SM-4TZ-144). (2018). http://www.amscope.com/.
3. Trigger-Action-Circuits
4. Making as the New Colored Pencil