In a Library where a Dictionary Catalogue is maintained we see entries of the type known as 'References' and also of the type known as 'Analytical Entries'.
A library catalogue tries to help the user to the maximum extent possible as a search tool. So, any difficulty we can visualise on the part of the user is to be countered by some kind of an entry in the catalogue. Similarly, any additional information found necessary and useful is to be provided by appropriate entries.
Uniformity is an essential feature in library cataloguing. Therefore, when there are several variations in the spelling of a name of a person or corporate body or when a term used as heading is having two or more synonymous terms there is a need to accept one particular form of the name or heading uniformly throughout the catalogue. On such occasions, to help the user, we will have to provide a reference.