Rome, Solved. is built from the articles below — this site’s own reporting, written at the same desk, not an outside authority. The book does not quote them. It connects what they establish and ends each decision in a verdict you can argue with, which means you should be able to read the parts.
Where a claim rests on something other than this reporting — a government rule, a carrier’s published terms, an official advisory — the book names that source in the line itself rather than leaving you to guess.
Last checked means someone re-read the article against its sources on that date. Most pages carry only a publication date, and that is the honest state: it is not a claim that nothing has changed since.