Definition: The Periodical Source Index, or PERSI, is the largest subject index to genealogical and historical periodical articles in the world. It is written in English and French (Canada). The time period of the articles ranges from the 1700s to the present. More than 1.1 million index entries from nearly six thousand titles are represented by this work and it is kept up-to-date on a monthly basis. Created by the foundation and department staff of the Historical Genealogy Department of the Allen County Public Library in Fort Wayne, Indiana, PERSI is widely recognized as being a vital source for genealogical researchers.

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Great Genealogy Research Libraries
Links and information about the world's best libraries for genealogy research, plus tips for conducting research in a library.

Standards for Using Record Repositories and Libraries
Standards for using records repositories and libraries, as recommended by the National Genealogical Society