I will write separately to you but for all those who would be tempted to do the same, please note that people notice this kind of things and this is officially called "plagiarism"and "copyright infringement". If this was an oversight on your part, please correct it.
An excerpt and only an excerpt of the text that interests you with a link back does not require of you to contact me. If I notice that your site contains pornography, racist slurs etc, then I will ask you to take out my contents. If you hesitate ask yourself what would be a "fair" usage, what you would like people to do onto you or contact me.
Now, a crash course in Plagiarism 101 from the University of Texas at Dallas:
Our many thanks to the readers who have reported these issues.
"To submit to your instructor a paper or comparable assignment that is not truly the product of your own mind and skill is to commit plagiarism. To put it bluntly, plagiarism is the act of stealing the ideas and/or expression of another and representing them as your own."
(Image from the University of New South Wales)