In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews.
Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are a number of approaches you could adopt depending upon the type of analysis underpinning your study.
Integrative Review Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated.
The body of literature includes all studies that address related or identical hypotheses or research problems.
A literature review is also a way to inform your own writing.
What is the scope of most articles in your discipline? Literature reviews can be a class assignment, an introduction to a paper or research project, a stand-alone article, or an introduction to a larger work, such as a thesis or dissertation. A literature review is about ideas, concepts, theories and hypotheses, results and projections.
The following are some of the more common types of literature reviews. A typology of reviews: an analysis of 14 review types and associated methodologies.
These are more rigorous, with some level of appraisal: Source: Grant, M. Health Information & Libraries Journal, 26(2), 91-108.
It does not usually discuss every possible work in the field-- but it should cover the relevant ones.
You are close to the end when you start running into the same authors, the names that your professors mention don't make you say "Who?