6- List of references:
6.1- Basic materials like Department notebook: Handouts of the staff member in the department
6.2- Essential books (text books) like Khalil IF, 1999: Biostatistics, Cairo University
6.3- Recommended books like Maxcy RL, 2008: Public health and preventive medicine.
6.4- Periodicals, Web sites, etc:
- WHO.int.com
- Pub. Med
- Science direct