b></span> <span class="reference-text"><span class="citation web"><a rel="nofollow" class="external text" href="http://www.zamperla.com/en/product/159/skater.html">"Zamperla – Skater"</a>. Zamperla<span class="reference-accessdate">. Retrieved 19 May 2011</span>.</span><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ADisk%27O&amp;rft.btitle=Zamperla+%E2%80%93+Skater&amp;rft.genre=book&amp;rft_id=http%3A%2F%2Fwww.zamperla.com%2Fen%2Fproduct%2F159%2Fskater.html&amp;rft.pub=Zamperl