Sources

I searched of each related topic on www.wikipedia.org, and then scrolled down to take a look at the secondary soucres, from where wikipedia had taken out the information.

In my persuasive speech, I'm talking about Racism and Discrimination, recalling much the events ocurring during WW2, the biggest scene of injustice and racism seen in history, the Holocaust.

Holocaust:
http://en.wikipedia.org/wiki/Holocaust#See_also

Provided us with other sources of similar information having to do with the Holocaust, probably used to provide the information for them in the 1st place.

Nazi:
http://en.wikipedia.org/wiki/Nazi#External_links
http://en.wikipedia.org/wiki/Nazi#References_and_notes

Some of the sources used by Wikipedia (in the web):
http://www.britannica.com/eb/article-9055014/National-Socialism
Though, this source, too, can't be considered secondary, because as Wikipedia it is an Encyclopedia, that bases its information from other secondary sources. I wasn't able to find the sources that Britannica used.
http://www.holocaust.com.au/glossary.htm

Antisemitism:
http://en.wikipedia.org/wiki/Antisemitism#External_links
http://en.wikipedia.org/wiki/Antisemitism#References

Adolf Hitler:
http://en.wikipedia.org/wiki/Adolf_hitler#External_links
http://en.wikipedia.org/wiki/Adolf_hitler#References

Mostly all secondary sources used were biographies, either on paper, or online.

Ghetto:
http://en.wikipedia.org/wiki/Ghetto#References
http://en.wikipedia.org/wiki/Ghetto#See_also
Similar topics, they might have provided each other with information.

*I noticed not all references come from the web, there are some which are based on books or magazines as well. Yet, most are secondary sources, cause not only is it hard to find original primary documents in the web, but secondary sources explain their contents much better.