Уземљење — разлика између измена

* Principles of Electric Circuits, 7th edition, Thomas I. Floyd, Prentice Hall. {{page|year=|isbn=9780-13-098576-7|pages=}}. pp. 50-51}}.

* Electrical Machines, Drives, and Power Systems, 4th edition, Theodore Wildi, Prentice-Hall. {{page|year=|isbn=9780-13-082460-8|pages=673}}. pp. 673.