Write clearly and concisely, 30-60 but no more than 150 words will usually suffice.
State the authority and qualifications of the author.
Describe the subject and scope of the work.
Indicate biases or limitations of the work.
Describe the intended audience, particularly if a level of expertise is necessary to appreciate the work.
Compare the work to others in the field.
Describe features of importance, e.g., indexes, illustrations, appendicies.
Avoid repetition of information explicit in the title.
State the use, significance and value of the work
Reliability, is this an original source, accurate, well-researched with logical arguments
If the work uses or is influenced by a particular theory that fact can be mentioned