Be selective when choosing sources to include in your review.
Start by looking for documents that highlight major developments and theories on a topic. Look for documents that generated significant contributitons to the field of study. Ensure coverage of all sides of the topic.
A good strategy is to start with the most recently published sources on your topic and search backwards. Recent studies will mention major crossroads and developments in the field, more recently and often historically. Depending on your topic, your literature review may cover some historical background with more focus on recent research, or it may cover recent and historical findings equally.
Use a range of resources including books, journal articles, websites, theses, conference papers, government document and reports to compile information on your topic.
Find books in the library catalogue
An easy way to find a book is to ask someone knowledgeable on your subject - librarians, professors, advisors, etc.
To get started, look up your topic in an encyclopedia and check the references at the end of the entry.
Look through the bibliography of key books for hints about leading theories, resources, and researchers in the field.
Search for articles on your subject.
Read through the literature review section of articles on your topic. Most articles contain a literature review section after the introduction.
Look for book reviews on your subject in the databases. Use Book Reviews to determine if a book covers your subject adequately and is worth reading.
Look through the bibliography of key articles for hints about leading theories, resources, and researchers in the field.
Request articles the library does not have through Interlibrary Loan.
Find out how many times an article has been cited by others to identify the most influential articles. Find highest impact journals using Journal Citation Reports.