1: Find a book you want to cite on Google Books.
Copy the URL of the book from the address bar, and paste it below. Then press "Load". Example book.
2: The fields below have been filled in automatically. Correct any mistakes and add the information you have. All fields are optional, but "Page number(s)" is very useful.
3: Below is the complete reference tag. Copy and paste it into the Wikipedia article. Press "Make citation" above to regenerate if you have changed anything above.