A Reference book is just a starting point that provides an overview of a topic. Don't cite these materials. The reason why we don't cite reference books is that they don't provide any original information. They only give you a condensed summary of what other people have said about a topic. Use these materials to give you ideas for a topic. Write down the relevant facts and keywords so that you can search in Primo or in the library databases to locate books and articles for your research.