IEEE (315-1975). American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams. Institute for Electrical and Electronics Engineering (IEEE). Retrieved from http://ieeexplore.ieee.org/document/985670/figures.
Capability Assurance Institute
The Art and Science of Solution Effectiveness
IEEE (315-1975). American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams. Institute for Electrical and Electronics Engineering (IEEE). Retrieved from http://ieeexplore.ieee.org/document/985670/figures.