i need advance PLC knowledge

i have a very basic knowledge in understanding PLC, i had a 40 hrs course which i found out to be so easy, but that was 6 years ago.

can anyone recommend a book that focus more on allen bradley?

Try this... http://www.plcs.net/book.shtml

and this is another http://claymore.engineer.gvsu.edu/~jackh/books/plcs/