Feynman, Richard; Leighton, Robert; Sands, Matthew (1964). The Feynman Lectures on Physics. 3. California Institute of Technology. ISBN 978-0201500646. 

Georgetown University

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Natural Science References

Jaeger, Gregg (September 2014). "What in the (quantum) world is macroscopic?". American Journal of Physics. 82 (9): 896–905. 

https://doi.org/10.1119%2F1.4878358 

What in the (quantum) world is macroscopic?

"The microscopic scale". Science Learning Hub. The University of Waikato. Archived from the original on 20 April 2016.

The microscopic scale

The Feynman Lectures on Physics

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