Your reference list contains the full details of the information sources (books, journal articles, websites, etc.) that you have cited.
You can find the information you need for different sources in a variety of locations. Books have a title page and pages with publisher, published date and edition details. Journals have details on the cover and in the table of contents. In electronic format, you can find all the details you need on electronic databases or on the internet.
For an example list have a look at the References List below.