Dr. Robert C. Worstell, Dorothea Brande, Claude M. Bristol, Earl Nightingale, Napoleon Hill (2017). “Mindset StackingTM Inspirational Journal VolumeSS01”, p.52, Lulu.com
Jonathan Swift (1768). “The works of Dr. Jonathan Swift ...: With the author's life and character; notes, historical, critical, and explanatory; tables of contents, and indexes. More complete than any preceding edition ... Accurately corrected by the best editions”, p.365