How to print out a cycle

Hi guys.I have a question.I do not want to any code,only can you explain your ideas in a few sentences.
if the graph is found to be cyclic how to print out a cycle??
http://stackoverflow.com/questions/8495439/printingnot-detecting-cycle-with-topological-sort

(Took a bit of time to locate a link which a. had just a few sentences and b. did not have any code).
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