Here are some. [link]http://www.alanhamby.com/paint.html[/link]
There are alot of references like this on the web. Keep in mind most are someones idea of what they think the paint looked like. Even original color pictures have faded, been printed from a slide, look different on different computer screens, etc, etc. Tanks in museums have been painted over many times.
When it comes down to it, paint what you like. You have to look at it. As far as mine goes.. when a veteran panzer commander tells me the color is wrong, then I'll listen.