Many works on this website are labeled as licensed under a Creative Commons license which requires attribution. For such documented, the attribution required is my name (Phil Dibowitz), and the URL (http://www.phildev.net/) to this site. The *safest* way for you to do that is to copy the HTML of the copyright statement at the bottom of the page. For example, the bottom of my SSL guide has this HTML which is full proper attribution: Phil's SSL Guide by Phil Dibowitz is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License. If you have any questions about duplicating or using any of my works, please email me, I'm more than happy to help you use my work in a way that meets my license.