1. Ahmad, N. (1974). Groundwater resources of Pakistan. Lahore: Ripon.
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, 12–14 September. Denver, USA: Colorado School of Mines and Geophysics.
5. Ahmad, Z., Ahmad, I., & Akhtar, G. (1994). A report on groundwater reserve estimation of the Ahmad Khan well field and its safe utilization for the 4000 TPD Luck Cement plant Pezu, D.I.Khan.