1. Ahmad, Z., Ashraf, M., & Siddiqui, R. F. (1997a). Groundwater computer modeling of the National Park area in the vicinity of Rawal Lake, Islamabad. Journal of Drainage and Water Management, 1, 8–21.
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. 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., & Serrano, S. (2001). Numerical groundwater flow modeling of the Rechna Doab Aquifer, Punjab, Pakistan. In Proceeding of international groundwater modeling conference (IGWMC), MODFLOW 2001 and other modeling odysseys. Colorado School of Mines and Geophysics, Denver, U.S.A., 12–14 September.
5. Ahmad, Z., Shaista, M., & Gulraiz, A. (1997b). Evaluation of groundwater potential of Islamabad area using logs data of test holes drilled by OGDC. Pakistan Journal of Hydrocarbon Research, 9, 91–101.