As one solution: One of the government offices in Ohio had issues a birth certificate for my grandmother almost a hundred years ago, but couldn't find the record in their own files now. I sent them a copy, and they finally were able to find the original and it is now part of their record. Some documents are online, or the agency involved can be helped to put it online, and then it can be cited. If you have access to online records, your documents might be online and they can be cited from there. Good luck!