Tertiary Sources
Tertiary sources are compilations of information coming
from secondary and primary sources; these can include lists
or collections, and are generally reference material that can
help you find, or direct you to, secondary and primary sources.
Examples of tertiary sources include:
- Encyclopedias, dictionaries, and almanacs
- Indexes
- Directories and guidebooks
- Manuals
- Databases, catalogs
- Most textbooks

Sources
East Central University – Information Literacy Defined © 2021 by Shawna Bishop, Haley Monroe, and Brandi Schur is adapted from The Insiders: Information Literacy for Okies Everywhere, licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.
These are compilations of information coming from primary and secondary sources. Examples include: encyclopedias, indexes, and most textbooks.