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Time Period

Each database differs in terms of:

  • the publication dates of the materials included
  • how frequently the database is updated


For example, notice the different time periods described for the magazines and journals in the database shown below:

Proquest Web page listing dates of its coverage for newspapers and journals

Some databases, such as those created by ProQuest and EBSCO, index every article in every issue of a specific publication. Databases that index every issue of a magazine each time it is published may indicate publication dates.

Some databases, such as SIRS Knowledge Source and Opposing Viewpoints in Context, select the articles they index from a variety of sources but do not index every issue of a periodical, so they may only indicate the date that they update the material in the database.

Chapter 4 — Page 9