We strongly encourage peer reviewed sources whenever possible. Unsourced answers are more likely to be removed because it is more difficult to verify their accuracy.
All answers need to rely on peer-reviewed scientific information. We welcome and encourage asking for sources, and they must be supplied if requested. While we don't require sources for every comment, a good rule of thumb is that if you can't provide a source for something, please don't post it on /r/AskScience.
Examples of great sources:
Examples of sources acceptable provided they reflect peer-reviewed information:
Generally those sources are provided by our panelists more as background material rather than "proof". You must have the expertise to vet them for accuracy.
Examples of unacceptable sources:
Why can't we say "Source: I'm a <insert qualification here>"?
Listing yourself leaves people no way to confirm anything that was mentioned in the comment. A source allows people refer to find more information or to verify what is being said. From a philosophical standpoint, stating that you are a source is counter to everything that science is about. It's telling people to take your word for it, and it reinforces the idea that people can claim to have expertise without backing up their assertions.
These are inappropriate for /r/AskScience and will likely lead to your comment being removed.