Question

What are the main souces of information collected?

Answer 1

A drawback is that it is costly to get hold of. Primary data is otherwise called raw information; the information gathered from the first source in a controlled or an uncontrolled situation.

The definition of a secondary source may vary depending upon the discipline or context. Most often how a source is used determines whether it is a primary or secondary source
For the purposes of a historical research project, secondary sources are generally scholarly books and articles.
Methods

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Answer 2

primary data is the main source of information collected which is ...