1. Advanced physics for today and tomorrow Tom Dancan
2. https://studylib.net/doc/5727740/form-2--16-magnetic-effect-of-electric-current---kcpe-kcse
3. http://www.elimu.net/Secondary/Kenya/KCSE_Student/Physics/Form2/Elec_Current
4. https://www.youtube.com/watch?v=PNKZlaDmqpU