I have just a answered a question because I knew where the information was (it was part of a response to another question authored by someone else). I gave the credit to that user by creating a link. Is this the correct way to give credit?
Please note that I did not include the complete link to older answer as I thought it may have confused the person asking the new question (he was asking something specific).
This the question I answered: What are the criteria for a user background to become login background on user selection?