A bibliography is a list of items, articles, and books on a particular topic. These lists often appear at the end of articles in scholarly journals or books as an aid to further research. Bibliographies often contain annotations - or descriptive notes - and the citations must adhere to the format found in a style manual.
The citation is the formal way to describe the item and gives the author, the title, and other specifics of the item.
An annotation is a brief description of an item, book, or journal article, appearing after the citation in a bibliography. An annotation includes a short summary of the content, an evaluation of the source, and a summary of the conclusions of the researcher.
There are two portions: the citation and the annotation. You might think of these as the address of the item and the description of the item. Notice, in the description, there is room for comments on the usefulness of the item for a researcher.
When you do your assessment, be sure to address the issues of currency, relevance, reliability, authority, audience, purpose, and point of view.
Image adapted from: Undergraduate Library, University of Illinois at Urbana-Champaign