Spacing and Punctuation

The APA Publication Manual now calls for one space to appear after all punctuation marks. This is undoubtedly in response to the capabilities of modern word-processing devices to determe the correct aesthetic distance between punctuation marks and subsequent letters. To double-space after a punctuation mark defeats that capability. If you are using a mono-space font (such as Courier), you may consider using two spaces after end-periods and colons, but consult your instructor first.

Exceptions:

• No space after internal periods in abbreviations (a.m., i.e., U.S.).
• No space after the colon in ratios (6:1)