Maybe, but with the extensive number of books, journals, magazines and newspapers scanned and available to view on the Internet Archive, it's never been easier

Maybe, but with the extensive number of books, journals, magazines and newspapers scanned and available to view on the Internet Archive, it's never been easier to add or verify a printed source citation. Also various other newspaper archives have mind-numbing amounts of scanned material dating back well over 100 years, and the Wikipedia Library provides free access to these resources for editors.