Jay Conrad Levinson (2007). “Guerrilla Marketing, 4th edition: Easy and Inexpensive Strategies for Making Big Profits from Your SmallBusiness”, p.14, Houghton Mifflin Harcourt
"Ian Somerhalder, ‘The Vampire Diaries’ Actor, Talks Love, Social Media And Social Change With Origin Magazine". Interview with Maranda Pleasant, www.huffingtonpost.com. April 21, 2013.