-
http://www.thefreedictionary.com/standardisation
-
http://dictionary.cambridge.org/dictionary/english/standardize
-
https://en.wikipedia.org/wiki/Tracing_paper
-
https://en.wikipedia.org/wiki/Tracing_paper
-
http://dictionary.cambridge.org/dictionary/english/standardize
-
http://www.thefreedictionary.com/standardisation
-
http://courses.ncssm.edu/gallery/collections/toys/html/exhibit07.htm