Looking for statistics and reports can be difficult, but Google offers some features that make the process of finding authoritative sources easier.
Wondering about the authority of a page you've found?
A good rule of thumb is to look at the domain extension, first (.edu, .com, .net, etc.).
While there are ups and downs to each domain, some of the best regulated are .edu (educational) and .gov (government). Try limiting your web search to these domains to improve the quality of your results.