This document provides guidance on finding sources that are older or newer than an existing source. It explains that a citation index tracks which sources cite which other sources, and several databases include citation index information. The document advises that to find older sources, one should see the list of references in the existing source, while to find newer sources one should see the citation index for the existing source.

1. DIRECTION IN TIME

2. An existing source can help you find sources that
go back in time (older) or forward in time (newer)
z A citation
index tracks
who cites
whom.
Several
databases
include
citation
index info.
Back in Time:
See List of
References Forward in Time:
See Citation Index

3. v
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