What is a DOI? A digital object identifier (DOI) is an article’s permanent online location. The DOI usually appears at the top of the article or in the database record for the article.
It serves two purposes:
Example: http://doi.org/10.25101/19.2
The reference list is a list of all sources cited in your APA paper. Each in-text citation should have a corresponding reference list entry. All APA reference list entries contain four main components: Author, Date, Title, Source.
Below is a diagram of where to find the four main components ( Author, Date, Title, Source) of an APA reference entry for a journal article:

The APA Style website provides sample papers including a reference list.
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