I need some help and guidance on what is a kind of sticky problem. Well, maybe not so much a problem but a talking point. I have just finished 'writing' a book which, if published, would amount to about 250 pages. It is a specialised book on a number of famous people in their fields. Now, I utilised many Wikipedia website texts for the manuscript. The very nature of the book leant itself to acquiring data and other facts surrounding these people from Wikipedia. So, in a way, it was more of an editing job although I contributed much original text. The big question regards copyright of Wikipedia materials. Now, my question is this, am I legally entitled to use Wikipedia in my book considering, as far as I am led to believe, all Wikipedia material is free to use and free of copyright? I have asked others in the publications industries and the answers I received are just not totally definitive. I am aware of citing Wikipedia contributors from the copyright angle but this is a 250 page book!! Any thoughts?