Describe the three main sources of literature review, and explain the order in which they should be used in research?

The three main sources of literature review are:

1. Primary sources: These are original research studies, articles, or documents that present new findings or data. Examples of primary sources include research articles, conference papers, dissertations, and government reports.

2. Secondary sources: These are sources that analyze, interpret, or summarize primary sources. Examples of secondary sources include review articles, literature reviews, and textbooks.

3. Tertiary sources: These are sources that compile and organize information from primary and secondary sources. Examples of tertiary sources include encyclopedias, dictionaries, and handbooks.

In research, the order in which these sources should be used is as follows:

1. Start with primary sources: Begin by reviewing original research studies and articles related to your research topic. This will help you understand the current state of knowledge in the field and identify gaps in the literature.

2. Move on to secondary sources: Once you have a good understanding of the primary literature, review secondary sources such as review articles and literature reviews. These sources can provide a broader perspective on the topic and help you identify key themes and trends in the literature.

3. Consult tertiary sources: Finally, consult tertiary sources such as encyclopedias and handbooks to gather background information and additional context on your research topic. Tertiary sources can help you deepen your understanding of the subject and provide valuable insights for your research.

By following this order, researchers can build a strong foundation of knowledge on their research topic and ensure that their literature review is comprehensive and well-informed.