Success Quotes - Page 64
John C. Maxwell (1995). “Developing the Leaders Around You: How to Help Others Reach Their Full Potential”, p.67, Thomas Nelson Inc
"Funny Ladies" by B. Adler, (p. 272), 2001.
"In Your 60s". Book by Judy Valon, 2009.
'Die fröhliche Wissenschaft' (1882) bk. 4, sect. 283
Frank William Taussig (2013). “Principles of Economics”, p.170, Cosimo, Inc.
Dale Carnegie (1953). “How to Help Your Husband Get Ahead In This Social and Business Life”