Question

The index that lists magazine articles according to subject is _____. encyclopedia Who's Who Readers' Guide bibliography

Answer 1

I believe that the index that lists magazine articles according to subject is Reader's Guide. 

Answer 2

The index that lists magazine articles according to subject is the Readers' Guide.

The Readers' Guide has been published since 1901 by The H.W. Wilson Company. It is used in public and academic reference libraries alike throughout the United States.