Googling some of these topics will result in a lot of crazy stuff - people feel very strongly about some of these topics, and you'll get crazies on both sides. Take care to present a balanced argument; if you have information from groups who oppose vaccinations, give information from those who support it, no matter your opinion. Just remember RADCAB and try to filter out the craziest of the crazies.
Search terms to try:
Here is the template for citing a website in APA style:
Author. (Date published if available; n.d.--no date-- if not). Title of article. Title of web site . Retrieved date. From URL.
Here is an example of an APA citation for a website:
Ganguly, M. (2014, October 14). Stopping the Small Hands of Slavery. Human Rights Watch. Retrieved October 14, 2014. From http://www.hrw.org/news/2014/10/14/stopping-small-hands-slavery.