Competence is required, Earl.  It's been explained to you many times that the citation goes to material covered in a reliable print source, and the material in question is appropriately hosted on the author's website.  Since multiple editors have corrected you on this point and there is consensus for the link and the material, I going to ask you to stop commenting on this subject.  In the meantime, please review WP:IDHT to understand why you have now breached the boundary between constructive editing and disruption which is blockable. If I have to explain this again, I will ask the community to take steps to prevent you from editing Wikipedia.  Thank you for your understanding, but this discussion is now over.