- https://www.amazon.com/Calculus-Dummies-Mark-Ryan/dp/1119293499/ref=as_li_ss_tl?s=books&ie=UTF8&qid=1478251262&sr=1-1&keywords=9781119293491&linkCode=ll1&tag=derivativecalculator-20&linkId=09fa60b46efefda2909b78cd2e6f98ea
- https://en.wikipedia.org/wiki/Parser
- https://en.wikipedia.org/wiki/Order_of_operations
- https://en.wikipedia.org/wiki/JavaScript
- https://en.wikipedia.org/wiki/Shunting-yard_algorithm
- https://en.wikipedia.org/wiki/LaTeX
- https://www.mathjax.org/
- https://en.wikipedia.org/wiki/Computer_algebra_system
- http://maxima.sourceforge.net/
- https://en.wikipedia.org/wiki/Differentiation_rules
- https://en.wikipedia.org/wiki/Canvas_element
- https://hammerjs.github.io/
