Jay Conrad Levinson (2007). “Guerrilla Marketing, 4th edition: Easy and Inexpensive Strategies for Making Big Profits from Your SmallBusiness”, p.14, Houghton Mifflin Harcourt
"Finding Joy in Life". Richard G. Scott's priesthood session address at the Quorum of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints in Salt Lake City, Utah, www.lds.org. April 1996.