Answered By: Kim Read Last Updated: May 18, 2017 Views: 1052
APA recommends two spaces after punctuation for "draft manuscripts", which includes assignments to make it easier for editors or instructors reading many manuscripts/assignments. For manuscripts that will actually be published in a journal, APA does not determine spacing. Each journal determines how many spaces to use, but most use only one space: http://blog.apastyle.org/apastyle/2009/07/on-two-spaces-following-a-period.html
However, in your references list, use only space after punctuation.
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