Books, Brochures, and Chapters>Book:  Zvonkin, Alexander (2006), Math from Three to Seven: The Story of a Mathematical Circle for Preschoolers, Retrieved on 2018-07-27

Electronic/World Wide Web>Internet Article:  Adams, Cecil (2017-03-01), How Did Anyone Do Math in Roman Numerals?, Washington City Paper, Retrieved on 2017-09-29

Source Material [www.washingtoncitypaper.com]

Books, Brochures, and Chapters>Book:  Neagoy, Monica (2017), Unpacking Fractions: Classroom-Tested Strategies to Build Students' Mathematical Understanding, ASCD, Retrieved on 2017-08-07

Personal Communications>Interview:  Wiles, Andrew (December 2, 2016), What does it feel like to do maths?, Retrieved on 2016-12-29

Source Material [plus.maths.org]

Books, Brochures, and Chapters>Book:  Seeley, Cathy L (2016), Building a Math-Positive Culture: How to Support Great Math Teaching in Your School, ASCD, Alexandria, VA, Retrieved on 2016-08-17

Electronic/World Wide Web>Internet Article:  Huber-Dyson, Verena (2.15.98), On the Nature of Mathematical Concepts: Why and How Dd Mathematicians Jump to Conclusions?, Edge.org, Retrieved on 2016-03-17

Source Material [www.edge.org]

Electronic/World Wide Web>Internet Article:  Minsky, Marvin ( Feb 16, 2008), What makes Mathematics hard to learn?, Retrieved on 2016-02-05

Source Material [web.media.mit.edu]

Electronic/World Wide Web>Internet Article:  academo.org, (2015), 19 TET Keyboard, Retrieved on 2016-02-05

Source Material [academo.org]

Electronic/World Wide Web>Internet Article:  David Jr., Jack H. (Spring 1995), The Mathematics of Music, Retrieved on 2016-02-05

Source Material [jackhdavid.thehouseofdavid.com]

Electronic/World Wide Web>Internet Article:  Simanek, Donald , Physics Problems to Challenge Understanding, emphasizing concepts, and insight., Retrieved on 2015-04-27

Source Material [www.lhup.edu]