Usage of chemistry abbreviation for Normal (N)

[Emoto <emoto1 -at- gmail -dot- com>]

Hi,

Can someone point me toward an authoritative source for usage of the N that
is short for normal? Is there a space between the N and its number value?

For example:

0.2N NaOH

or

0.2 N NaOH

I'm working on a bunch of docs that have this in them and would like to
make them all consistent, and would like to base my decision on more than
what looks good to me. I like the space in front of the N, but would
happily bow to some higher authority.

Thanks,

Bob
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