The type of source (primary, secondary or tertiary) can be identified depending on the author and the process of creation.
This includes sources creatin by witnessing or experiencing an event. For example, a diary about a war is classified in this category.
This differs from a primary source because it is not a first-hand account, insted it uses a primary source to create another source. For example, a summary of the diary about war.
This uses both primary and secoundary sources. For example, an analysis about a topic.
Note: This question is incomplete; due to this, the answer is based on general knowledge.
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