Tertiary sources consist of information which is an overview and collection of primary and secondary sources. An example may be the bibliography at the end of a journal article or encyclopedia entry.
Some types of secondary sources include:
- Bibliographies (also considered secondary)
- Dictionaries and Encyclopedias (also considered secondary)
- Fact books
- Indexes, abstracts, bibliographies used to locate primary and secondary sources
- Textbooks (also be secondary)