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{{Commons category|Spark plugs}}
* [http://www.classic-car-magazine.co.uk/articles/spark_plug_colour_guide_chart.html Spark plug condition and fault diagnosis]
* [http://www.carsparkplugs.com/identifying-spark-plugs/ Identifying Spark Plugs] {{Webarchive|url=https://web.archive.org/web/20140808083257/http://www.carsparkplugs.com/identifying-spark-plugs/ |date=2014-08-08 }}
* [http://books.google.com/books?id=bCEDAAAAMBAJ&pg=PA104&dq=popular+science+July+1946&hl=en&ei=hc3oTO6dCYvonQfQu5iaDQ&sa=X&oi=book_result&ct=book-thumbnail&resnum=10&ved=0CE4Q6wEwCTgU#v=onepage&q&f=true "Here's How A Spark Plug Works", November 1945, ''Popular Science'']