There are different types of research papers and it means that annotated bibliographies in them do not fit to one certain standard. For each type of paper, there is a specific type of annotated bibliographies to be used. The types of annotations differ depending on what you wanted the reader to learn about the source or sometimes specifically about the author of the source. Usually assignments on papers contain basic information about the format of your work, including the annotated bibliography. But most of the time the description does not include the type of annotated bibliography. If this is your case, then you basically have two choices: either to just guess the type or conduct an analysis of your assignment to a certain extent. For example, the assignment may tell you that your annotated bibliography should give evidence proving a critical understanding of the sources you have used.
 
The word critical hints you that you must evaluate the sources you’re working with and provide some kind of critique.
 
Ok, so there are some basic types of annotations that are, in turn, divided into smaller groups. Summary annotations have to give the summary of the source; furthermore, they are divided into 2 groups: informative and indicative. Summary or summarizing annotations in general have a couple of defining features. First of all, they sum up the content of the source, which is similar to a book report. Another thing is that they present an overview of the arguments, facts, proofs and evidences that are given in the work and state the resulting conclusion. You must not judge the work, you have to discuss it. The proper way of creating a summarizing bibliography would be adding some facts about the author’s methodology or approach to the material.
 
Another type of annotated bibliographies considered to be a summary annotation is an informative annotation. They usually appear to be basic summaries, but they often highlight relevant information about the author or the work itself.
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Bibliography is a list of sources the material of which was used while writing an essay, a dissertation, a course paper or a research paper. Bibliography is usually put at the end of the paper in the format of the citation style required. It is important to present bibliography in the proper way as any person might need to use the same sources one has already used and indicated in bibliography.
 
There are two main types of bibliography:

• Enumerative bibliography

The basic information to be provided in the enumerative bibliography as to the source of the material cited is the author of the source, might it be a book or a small article, apart from the author the subject, topic etc. It can be arranged in different ways

• Annotated bibliography

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