1. 123D Circuits Electronics Lab. Autodesk 123D Circuits. Retrieved September 3 2017 from https://123d.circuits.io. 123D Circuits Electronics Lab. Autodesk 123D Circuits. Retrieved September 3 2017 from https://123d.circuits.io.
2. Massimo Banzi and Michael Shiloh. 2014. Getting started with Arduino: the open source electronics prototyping platform. Maker Media Inc. Massimo Banzi and Michael Shiloh. 2014. Getting started with Arduino: the open source electronics prototyping platform. Maker Media Inc.
3. Crossed Wires
4. End-user software engineering