I am in the scenario where I have my content duplicated over multiple cross domains. I don't want to get penalized for my original site by Google for it. So what is the best option to avoid this. I came to know about the cross linking i.e giving link of my original article at the last of republished articles, is this okay? Is there any standard format of linking like..
Cross posted from: http://myoriginalsite.com/myarticle
Referenced: http://myoriginalsite.com/myarticle
Original article: http://myoriginalsite.com/myarticle
Which of above will be good?