1. Descriptive summaries of the sources. Although these sound straightforward, simply listing the topics discussed in an academic or scientific study is not an effective strategy for how to write an annotated bibliography. The point is to tell readers about the research problem, the methods used to address it, the findings obtained, the conclusions drawn and the main argument developed in each of the sources. If the guidelines you are following indicate that descriptive information is all that is required for your annotated bibliography, critical and evaluative commentary will not be necessary, though it is always wise to highlight content of special relevance to the particular research project, publisher or course for which the bibliography is written. Annotated bibliographies in the sciences are rare, but when they are written their annotations tend to be exclusively descriptive, so summarising and paraphrasing may constitute the primary approach for how to write an annotated bibliography in the sciences.