Reference — scored on the SourceScore Index

2 sources in the reference category, ranked by SourceScore Index. Average Index across this category: 90.

1. #1
   Wikipedia (English)

   en.wikipedia.org

   Crowd-edited encyclopedia with ~7M articles and per-article inline citation discipline.
   A·94
2. #2
   Encyclopædia Britannica

   britannica.com

   Editor-supervised encyclopedia with named contributors + editorial-board oversight; complement to Wikipedia's crowd-edited model.
   A·85