reference guide
nounUK /ˈrɛf.ər.əns ɡaɪd/
US /ˈrɛf.ɚ.əns ɡaɪd/
A reference guide is a book or page you look at to find facts or help.
I used a reference guide to learn the names of the planets.
OTHER MEANINGS
2. A quick lookup tool that lists facts in a simple way.
The library keeps a reference guide by the front desk.
3. A short document that explains how to use something.
The teacher gave us a reference guide for the science project.
4. A trusted source people check for correct information.
For spelling, she treats the dictionary as her reference guide.