Jane Nelson is the author of positive discipline for empowering parents and also for class management and a lot more.
if you are interested in her methodologies, please check her website.
you can get her books from the website I highly recommend :
1-Positive discipline main book ( for parents and teachers)
2-Positive Discipline A-Z – A 1001 Solutions to Everyday Parenting Problems (for parents and teachers)
3-Positive Discipline Classroom Package (for teachers)
also, please check positive discipline YouTube channel
Enjoy and Get the best out of it!