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Wayne W. Dyer (2009). “Your Erroneous Zones: Step-by-Step Advice for Escaping the Trap of Negative Thinking and Taking Control of Your Life”, p.21, Harper Collins
Oldiees Publishing, James Allen (2015). “The Book of Discipline: Out From the Heart - AUDIO EDITION OF SELF IMPROVEMENT IDEAS & INSPIRATIONAL QUOTES FOR PERSONAL DEVELOPMENT”, p.16, Oldiees Publishing
Lauren Oliver, Veronica Roth, Lauren Conrad, Sara Shepard, Kiera Cass (2012). “Must-Read Teen Novel Sampler: For the Teen in All of Us: A Collection of Fabulous Reads”, p.24, Harper Collins