possible sources for my research paper

one:

"Euthanasia" 30 November 2008. Wikimedia Foundation Inc, United States. 07 December 2008. <http://en.wikipedia.org/wiki/Euthanasia>

Though in the past, Wikipedia has been a very risky option for students, this particle article has been 'protected' by the website, therefore it could be considered a legitimate source. Also, Wikipedia was never mentioned as being forbidden.
Wikipedia is an online encyclopedia, with roughly ten millions articles, all written by volunteer. as always, the articles starts out with a brief breakdown of the word, "euthanasia" literally means "good death" in Ancient Greek, and then continues on to describing its history.
An online encyclopedia is particularily handy while writing a researh paper because of its lack of bias. Wikipedia is very useful, because it provides both sides of the arguement so one could see both ends of the spectrum.

two:

Young, Robert. "Voluntary Euthanasia" 2008. Stanford Encyclopedia of Philosophy. 07 December 2008 <http://plato.stanford.edu/entries/euthanasia-voluntary/>

Many difficult words, repeating same opinions and the sheer length all contribute to the article's thickness. It is a very indecisive article, first arguing for euthanasia, then arguing against, but it does give multiple vaild points for each side.
I would believe Stanford's online encyclopedia to be a very reliable source because of its reputation and its ".edu" stature (meaning it had to be a place of education)