To tell a story
A research paper
Easy to read with a pleasant, conversational tone, interesting rhetorical devices, and lots of creative writing
Strictly informative with a straightforward style, fewer fancy writing techniques and lots of simple facts.
Academic journals, newspaper articles, websites with ".edu" or ".org" endings, or other academic sources with authors that stand by their data and assertions
Personal Experience and Anecdotal Evidence
Webpages with no authors
Unqualified statements that assert an undeniable truth, such as "cell phones cause cancer."
Qualified statements that allow for the possibility that you are wrong, such as "the evidence shown suggests that cell phone users may be more likely to get cancer than non-users."
As many people as possible--at least 30 or 40.
I only need to give it to 10 or 20 people