14 April 2014
The Velcro Principle? Yes. That's the one we follow when trying to decide how to arrange all the elements of a citation: "Don't separate what ought to stick together."
- A page number for an imaged document should be part of the citation to the document—not part of the citation to the film or website on which the document was reproduced.
- An image number within a database should be attached to the database, not the original document.
- A frame number for a roll of microfilm should be attached to the identification of the film, not the document itself.
- A citation to a National Archives microfilm, which cites NARA's publication number, should then cite the roll number within that NARA publication—not a roll number or call number that appears on the copy of the film that's in your particular library's microfilm drawer.
All that is just "common sense. Still, "common sense" so often falls off the table when we sit down with a bunch of details about a source and try to fit them all together.