User talk:P.toncheva

Recent edit to Viral marketing
Hello, and welcome to Wikipedia. I noticed that you made a change to an article, Viral marketing, but you didn't provide a reliable source. It's been removed for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you!  Onel 5969  TT me 12:48, 11 August 2015 (UTC)