References 
Brief Bibliography and Web Resources on Mapping Diagrams  
Work/Spreadsheets 
Worksheet.pdf

Spreadsheet
Template (Linear
Functions) 
Section from MD from A
B to C and DE (Drafts) 
Visualizing Functions: An Overview  Linear
Functions (LF) Quadratic Functions(QF) 
GeoGebra  Sketch to Visualize Solving a Linear Equation using Mapping Diagrams 
Using Mapping Diagrams to Make Sense of Functions and Equations 
YouTube Videos 
Using Mapping Diagrams to Visualize Linear Functions (10 Minutes)

Solving Linear Equations Visualized with Mapping Diagrams. (10 Minutes)

Future Links: 2018  British Congress of Mathematics Education Warwick 36 April 2018 
Complex Analysis:THE HITCH HIKER'S GUIDE TO THE PLANE, Second edition Ian Stewart and David Tall (Cambridge U.P., 2018?) 