secondary source

1. A written commentary which discusses previously produced original work of another author, especially a notable author.

2. A study of past events or a past author written from the perspective of a later period of time; a document that draws on one or more historical primary sources and interprets or analyses them, including documents such as newspapers whose accuracy is open to question.

   Sekundärquelle

1. He got all his information from secondary sources.

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2. When writing a dissertation, it is important to heavily scrutinise your secondary sources.

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