Actually, it should look like:
1. Book Chapter 1
2. Book Chapter 2
3. Book Chapter 3
3.1 Paragraph 1 of book chapter 3
3.2 Paragraph 2 of book chapter 3
3.3 Paragraph 3 of book chapter 3
3.4 Paragraph 4 of book chapter 3
4. Book Chapter 4
5. Book Chapter 5
Similar to how wikipedia does it.