Hi, here are some references:
"Plane Algebraic Curves" by Brieskorn and Knorrer, around page 370.
"Plane Algebraic Curves" by Fischer, Appendix 4.
is a Monthly an article from The College Mathematics Journal about the Newton polygon as developed by Newton.
I especially recommend the first reference because it has a wealth of pictures.
(However, it is a monster of a book.)