Hey MtCoco,
Typically these are the reference numbers for the article or study that the factual information came from in that paragraph.
If you look at the end of the chapter, or at the end of the book, there should be a list of references where you can find the actual study or article that the information came from.
Reading or researching the referenced article or study isn't necessary to do well on the exam, but it may help increase your knowledge.
Good Luck!
Dave


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