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Consider whether the details about the visual identity are relevant in an encyclopedic article about the museum in general. If you think they are too specific, you can also consider adding parts of it to the articles of the designers instead.
The articles should be sourced differently, this article is not published by the Stedelijk Museum Amsterdam, so the reference should look something like this:
Katie Treggiden, ""Wim crouwel in conversation"", Confessions of a design geek, 2011. Retrieved on 2013-09-29.
And finally, note that Wikipedia is a work in progress, so your paragraph doesn't need to be perfect before it can be added to the article. Succes with your project. –   "