I work at a company that publishes standards. These publications have a designation and a title. For example, the designation might be "Standard 100." The title might be something like "Machines Handbook."
Most (but not all) of our publications punctuate the in-text reference as follows:
Standard 100, Machines Handbook
I was wondering if it is more proper to treat the title as a subtitle and punctuate it as follows, with AP guidelines concerning reference material in mind:
Standard 100: Machines Handbook
I've been looking at all my online resources, and none seem to take this specific case into account when addressing title punctuation. My ancient copies of Rude's Technical Editing and Reisman's A Style Manual for Technical Writers & Editors are not helpful, either. ISO appears to use the comma/italicized style. It would be nice to hear how professional editors would handle this if they were in charge of setting a standard for style.