1. Ahmad, Z., Ahmad, I., Gulraiz, A., & Ashraf, A. (2006). Hydrological analysis of Islamabad watershed area. Islamabad Journal of Science, 15, 80–97.
2. Ahmad, Z., Kausar, R., & Ahmad, I. (2009). Implications of depletion of groundwater levels in 3 layered aquifers and its management to optimize the supply demand in the urban settlement near Kahota Industrial Triangle area, Islamabad, Pakistan. Environmental Monitoring and Assessment, 172, 1–15. doi: 10.1007/s10661-009-0983-9 .
3. Ahmad, Z., & Khawaja, A. A. (1999). Three-dimension flow and solute transport modeling of the Eolian Aquifer in a uniform flow field of a chemical plant. Pakistan Journal of Hydrocarbon Research, 11, 59–74.
4. Ahmad, Z., Shaista, M., & Gulraiz, A. (1997). Evaluation of groundwater potential of Islamabad area using logs data of test holes drilled by OGDC. Pakistan Journal of Hydrocarbon Research, 9, 91–101.
5. Andrews, C. B., & Neville, C. J. (2003). Groundwater flow in a desert basin: Challenges of simulating transport of dissolved chromium. Groundwater, 41(2), 219–226.