Posting picture for tumblr help?

When i upload a picture and when people click on the picture i want it to direct to the page to where the picture was found. Cause i don't want to take credit from the owner and even though i said it in my description and giving credit to the rightful owner. Lile if you get a picture from www.blahblah.com/gk27y and post it on tumblr and when people click the pic it will direct them to that page not mines