te_ref-British_Hit_Singles_.26_Albums_1-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><span class="citation book">Roberts, David (2006). <i><a href="//en.wikipedia.org/wiki/British_Hit_Singles_%26_Albums" title="British Hit Singles &amp; Albums">British Hit Singles &amp; Albums</a></i> (19th ed.). London, UK: <a href="//en.wikipedia.org/wiki/Guinness_World_Records" title="Guinness World Records">Guinness World Records Limited</a>. <a href="//en.wikipedia.org/wiki/International_Standa