One of the most important steps in research is to select the appropriate database for your topic. There are many different kinds of databases out there but you're looking for a bibliographic-type resource that covers the literature of a field. The following databases provide comprehensive coverage for mathematics.
The following journals provide comprehensive coverage for mathematics.
The following books have recently been added for mathematics.
The following is a good source to find books in mathematics.
The following websites provide data, reports, and other information from government and professional agencies.