I have idea that could simplify attribution authors by thirdparties (mirrors, printed versions, etc.).
We could include all contributors to the article in a footer, but hide them in normal page view using appropriate style.
Entity that re-use the article would have to disable this one particular style, so all authors show up.
It would look like:
<li id="f-credits">This page was last modified 18:09, 6 Feb 2005 by Wikitravel user Wojsyl.
Based on work by Jan Słupski and Mark Jaroski, Wikitravel user(s) Dimitris,
Anonymous user(s) of Wikitravel and others<span id="f-authorshid"> (Alan, Miche, Wojtek, Adam)</span>.</li>