1. Baaj, H., 2001. Personal Communication, April 6, 2001. Advisor to the Minister of Public Works and Transport, and Associate Professor of Transportation at the American University of Beirut, Beirut.
2. Real-world vehicle emissions: a summary of the tenth coordinating research council on-road vehicle emissions workshop;Cadle;Journal of Air and Waste Management Association,2001
3. Central Administration for Statistics, 1998a. Households Financial Statuses in 1997/9, CAS, Beirut.
4. Central Administration for Statistics, 1998b. Active Population in 1997/12, CAS, Beirut.
5. Central Administration for Statistics, 1999. Household Budgets in 1997, Part 1/13, CAS, Beirut.