12 References (Pressbooks)
Z.W. Hyde (2016) The Guide to Pressbooks for EDU, https://eduguide.pressbooks.com/
B. Pfifer (-) Multimeters 101: Basic Operation, Care and Maintenance and Advanced Troubleshooting for the Skilled Trades, https://ecampusontario.pressbooks.pub/multimeters101/
Pressbooks (2013) The Growing Guide to Using Pressbooks, https://guide.pressbooks.com/