Now, the question is how to write a dissertation literature review, firstly, start with the thesis statement while writing introductory paragraph, secondly, the main body comes for your literature review that consists of sub-paragraphs, and finally, your opinion counts. You can get a literature review sample for better understanding.
Thus, your review will first sum up the detailed research that you put your efforts to gather information from the available data with your critical evaluation. This is the point you give all your logical and critical views according to your thinking. Though, you can zero in on other literature reviews in order to prove your points or explain something, remember to add these in the bibliography.