Simmons, J. P., & Simmons, P. (1999). Soares book on grounding (7.).
Lua i Stíl Chicago (17ú heag.)Simmons, J. Philip, agus Philip Simmons. Soares Book on Grounding. 7. Richardson, Texas : International Association of Electrical Inspectors, 1999.
Lua MLA (9ú heag.)Simmons, J. Philip, agus Philip Simmons. Soares Book on Grounding. 7. 1999.
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