When you try to edit a publication in Wikipedia, you are going to make one citation, be careful with the link of the book, if you would like to use Amazon link for one book, system refuse it, and you have to change the citation in code page.
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Brian Lamb
That is true! Wikipedia does not like links to “commercial” sources designed to make money. Hopefully you can apply learning like to a project that makes use of Wikipedia or the Wikimedia Commons.