:::So can we call the section "Water contamination" then? I guess I'm asking if there's anything else that methane and fracking fluid can affect other than a water supply. The reference format you're referring to is probably list-defined references: instead of placing a load of reference code within the article content, we put that stuff right in the Reference section instead, then refer to them by name in the article. Check the link and if you have questions about it feel to to ask on my talk page  I transferred this entire article's refs to that format, made it easier to edit, but sorry if it confused. ''' '''