Discipline Without Shouting or Spanking

I bought a book recently which is all about how to discipline pre-school kids. The book has lots of topics and problems usually encountered by parents with preschool kids and gives most practical solutions on how to deal with such problem.

I have read some part of it and for me, it's a good book since I believe in a diplomatic kind of discipline (the one without shouting or spanking). But still I can't deny that there have been times that I shouted at my toddler.. and I want to change it. I just hope that I would always have the needed self control whenever my son will have his tantrums.