I found a PDF for the deletion of B + tree here : http://avid.cs.umass.edu/courses/445/f2008/17-tree-indexes-2.pdf
I have probelm with the initial B+ tree itself. What I have studied till date is that every node has a copy in the leaf nodes. But here they have not take the copy for the nodes . like copy of 13 and 17 and 30 is not present in the leafs. What I am doing wrong here.