Standards for units and values

["Hauglie, Joe" <jhauglie -at- ti -dot- com>]

Hi, everyone. I've got a thorny (and emotionally charged) question to ask. Here's the issue:
 
What are the acceptable standards for writing numbers and units? In abbreviating units, for example V for volts, do the standards support using a space before the unit or not?
 
Example:
with space
36 V
24.5 pF
 
without space
36V
24.5pF
 
To follow on, if the standards support using a space, do they also support using a hyphen when using the number/unit as an adjective or descriptive phrase, or not?
 
Example:
36-V reference
or
36 V reference
 
24.5-pF capacitor
or
24.5 pF capacitor
 
Most importantly, I need to have a published reference that supports your usage position.
 
Many thanks -
 
Respectfully,
 
Joe Hauglie
Technical Editor
Texas Instruments
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