[recommendation] please recommend text for Green function~

Nowdays i am trying to self-study the green function.

Anybody can recommend me a good book for self-study?

P.S. i major in antenna. ^^

u shold serach on google
and any basic book of maths
one of book is

book Green's Function Estimates for Lattice Schr?dinger Operators and Applications. (AM-158) by Bourgain, J., published by Princeton ...

What you are actaully trying to understand by reading Green's function..?
Kind advice to you is that don't read it directly..as on a isolated topic...Check out application or sort of something where u need Green Function...Do u have any idea of it...?
There is only single book which has given Green's function precisely...
"Advanced Electromagnetics Engineering" -C.A.Balanis...Last chapter is toatlly devoted to it...
If you want to discuss ...I am also open to it..and in fact I am also a beginner in Green's function reading...