Geograph - photograph every grid square

It's usually best to paraphrase information from other sources and then add a reference (or hyperlink) to those sources. If you want to quote something verbatim, you need to ask the author for permission to use it and to re-licence it under the Creative Commons licence - which essentially means they not only allow you but the whole world to use their text, provided credit is given. If you have their permission to re-use their text, you should still acknowledge that it's theirs.

It doesn't matter if the text you wish to quote is from a commercial printed work, a website or just a handwritten note the original author wrote just for your information.

(Inspired by a question asked by Jon2 and answered by barryhunter on the forum http://www.geograph.org.uk/discuss/index.php?&action=vthread&forum=18&topic=13068&dontcount=1&page=0#6 .)