Answer:
These are sources that index, abstract, organize, compile, or digest other sources. Some reference materials and textbooks are considered tertiary sources when their chief purpose is to list, summarize or simply repackage ideas or other information.
Explanation:
Data from an experiment is a primary source. ... For example, articles and books in which authors interpret data from another research team's experiment or archival footage of an event are usually considered secondary sources. Tertiary sources are one further step removed from that.
