<a href="https://en.wikipedia.org/wiki/World_War_II" id="mwjw" rel="mw:WikiLink" title="World War II">World War II</a>: The <a href="https://en.wikipedia.org/wiki/Kragujevac_massacre" id="mwkA" rel="mw:WikiLink" title="Kragujevac massacre">Kragujevac massacre</a> against Serbian men and boys takes place.<sup about="#mwt22" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-2"}}' id="cite_ref-2" rel="dc:references" typeof="mw:Extension/ref"><a href="./October_21#cite_note-2" id="mwkQ" style="counter-reset: mw-Ref 2;"><span class="mw-reflink-text" id="mwkg">[2]</span></a></sup>
<span class="mw-reference-text reference-text" id="mw-reference-text-cite_note-2"><cite about="#mwt19" class="citation book cs1" id="CITEREFLampe2000"><a href="./John_R._Lampe" id="mwBuU" rel="mw:WikiLink" title="John R. Lampe">Lampe, John R.</a> (2000) [1996]. <a class="external text" href="https://books.google.com/books?id=AZ1x7gvwx_8C" id="mwBuY" rel="mw:ExtLink nofollow"><i id="mwBuc">Yugoslavia as History: Twice There Was a Country</i></a> (2nd<span id="mwBug" typeof="mw:Entity"> </span>ed.). Cambridge, England: Cambridge University Press. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBuk" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBuo" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-521-77401-7" id="mwBus" rel="mw:WikiLink" title="Special:BookSources/978-0-521-77401-7"><bdi id="mwBuw">978-0-521-77401-7</bdi></a>.</cite><span about="#mwt19" class="Z3988" id="mwBu0" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Yugoslavia+as+History%3A+Twice+There+Was+a+Country&amp;rft.place=Cambridge%2C+England&amp;rft.edition=2nd&amp;rft.pub=Cambridge+University+Press&amp;rft.date=2000&amp;rft.isbn=978-0-521-77401-7&amp;rft.aulast=Lampe&amp;rft.aufirst=John+R.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DAZ1x7gvwx_8C&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AOctober+21"></span></span>