Hi,
I would like to divide bibliography in three subparts:
Books
Articles
Technical norms
At the end of the thesis I would like specified this devided bibliography like for example:

BOOKS
1 book one
2 book two
3 book three

Articles
4 article one
5 article two
6 article three

Tehnical norm

7 norm one
8 norm two
9 norm three

Internet sources
10 link one
11 link two
12 link three

Thanks in advance