A "scientific reference" means a credible source that is written by an expert. You may also hear terms like "scholarly" or "academic" or "peer-reviewed" to describe these sources. How can you tell if something is a "scientific" reference? Here are some things to look for:
In every academic field, there are experts and scholars whose job it is to do research in their field. They are often professors at universities or employees of think tanks, hospitals, or labs. Experts share their research by writing articles about what they studied and how they studied it, and then publishing them in "peer-reviewed" or "scholarly" journals. These studies are considered "original research."
How can I tell if an article contains original research?