Actually it is a pdf document which I downloaded fro that website. It would be a simple task to put
Original Source at the end of your article...or References
As regards the comment about sharing... it is not clear that the entire work is someone elses....using italics could easily be taken as formatting to clarify the exercise.
Ok thank you for your tips on this. I will make sure when quoting or using things, in the future, that I put this in. :D