Should there be a space

  • after “No.”, “p. (=page)” before numbers

  • and after “a./p.” before “m.”

  • Is there a reason why you didn't ask each in a separate question? They are not all that related and it makes people searching for an answer to either not find them so easily. – M.A.R. Jan 8 at 0:36

MLA and APA, although not explicitly outlined anywhere I can find, use a space after "p."/"pp.".

"No." also is followed by a space (see the aforelinked MLA page and here for an example in APA).

There is never any space in "a.m." or "p.m.", but some style guides say to not use periods either, or to use small caps (please see the source; small caps don't work well here):

The Associated Press Stylebook:
4 p.m.

Microsoft Manual of Style:
4 P.M. (However, Microsoft prefers 24-hour time notations, in which 4 P.M. is 16:00.)

The Chicago Manual of Style
4 p.m. (recommended)
Also 4 PM or 4 P.M. (with PM in small capitals)

Garner's Modern English Usage:
4 p.m. or 4 PM (with PM in small capitals)

The Gregg Reference Manual:
4 p.m. or 4 P.M. (with PM in small capitals)

A.M., P.M., a.m., p.m.: What Is the Correct Time?

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