- UK IPO, one example of a national trade mark office
- 15 U.S.C. 1111. [15 October 2012].
- C1 Controls and Latin-1 Supplement
- PSF Trademark Usage Policy. PSF Trademark Usage Policy "The first or most prominent mention of a Python trademark should be immediately followed by a symbol for registered trademark: "®" or "(r)"."
- Gregory H. Guillot. A Guide to Proper Trademark Use. 1995-2007. A Guide to Proper Trademark Use
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