Answered By: Todd White
Last Updated: Oct 18, 2018     Views: 127

According to Publication Manual of the American Psychological Association, 6th edition -

"4.01  Spacing After Punctuation Marks

Insert one space after

  • commas, colons, and semicolons;
  • periods that separate parts of a reference citation; and
  • periods of the initials in personal names (e.g., J. R. Zhang)."  (pp. 87-88).

So, it looks like one space is the answer.

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