I have the usborne internet linked world history dictionary (for children). They deal with this by maintaining a website with current links to the relevant information, rather than typi g the addresses into the book. Also, what reader wouldn't rather click a link than type in an address?
http://www.usborne.com/quicklinks/e...x?cat=1&loc=usa&area=H&subcat=HE&id=3922

That's an endless task. No? Here. The best way to write is to outline a series of questions and then answer them. Obviously you haven't reinvented the wheel if you're writing a non-fiction book rather than a research paper. There'z a thing called paraphrase plagerism, which is when you copy someones words you have to quote them...when you copy someone's ideas u still have to quote them or it's paraphrase plagerism. Well, since we've all been educated all our lives, and innundated with conversations and entertainment, well it all came from somewhere.
here's some more information where ai plagerized this information from:
http://writing.wisc.edu/Handbook/QPA_plagiarism.html

I'd suggest figuring out what questions you want to answer in your book, answering them to the best of your ability off the top of your head as if you're answering them for your own child. If you're referencing something that is most people wouldn't have thought of (from our common education) then give credit for them. I wouldn't worry about it too much at this stage of the book. Write. Rewrite. When you're done make notes where you've quoted somebody or referenced an idea that's somebodys and not commom knowledge. If you're looking at wiki to help you organize your ideas in the first draft, you'll sift those ideas in the final draft to see which ones you need to give credit for, then look up who to credit. I am not a book writing lawyer, but I say-start writing. This can be sorted out later. Your publisher and editor will help you.

-signed,
a lady with too many unwritten things on my bucket list
(who's thought about these things)


Youth lives by personality, age lives by calculation. -- Aristotle on a calendar