:::::::Don't you have the decency to recognize a mistake Mathsci? If you look on Amazon, you will see that the author of the book you recommend ("Frederic P. Miller") specializes in compilations of Wikipedia articles, and labels his books "High quality content by Wikipedia articles". I'm afraid this goes to show the double-standards of your attitude about sourcing: pompously asking of others the sourcing quality of a doctoral thesis, but, when it fits your own convenience, putting forward the first source that props up on Internet, even if just a re-publisher of Wikipedia articles? A word of apology would be OK though, as well as a more tolerant attitude towards my own contributions: nobody's perfect, and I do appreciate your work otherwise. Best regards  ✍