EU #Interinstitutional #style #guide ~ available in all #European #languages

http://publications.europa.eu/code/

https://publications.europa.eu/en/publication-detail/-/publication/e774ea2a-ef84-4bf6-be92-c9ebebf91c1b

The PDF is of the 2011 edition. All changes since then are signalled on the news page of the style guide website:

http://publications.europa.eu/code/en/en-000300.htm