Уземљење — разлика између измена

* -{Principles of Electric Circuits, 7th edition, Thomas I. Floyd, Prentice Hall}-. {{page|year=|isbn=978-09780-13-098576-7|pages=}}. pp. 50-51.

* -{Electrical Machines, Drives, and Power Systems, 4th edition, Theodore Wildi, Prentice-Hall}-. {{page|year=|isbn=978-09780-13-082460-8|pages=}}. pp. 673.