Ahmad, 5. U. K., Zaini Ujang, P. D. I. D., Chong, H. W., & Lumpur), A. S. a. T. C. (. :. 2. :. K. (2002). Quantitative determination of organochlorine pesticides and polycyclic aromatic hydrocarbons in sewage sludge. Skudai : Universiti Teknologi Malaysia.
Chicago-viite (17. p.)Ahmad, 561482 Umi Kalthom, Prof. Dato' Ir. Dr Zaini Ujang, Huey Woon Chong, ja Asian Science and Technology Congress (4th : 2002 : Kuala Lumpur). Quantitative Determination of Organochlorine Pesticides and Polycyclic Aromatic Hydrocarbons in Sewage Sludge. Skudai : Universiti Teknologi Malaysia, 2002.
MLA-viite (9. p.)Ahmad, 561482 Umi Kalthom, et al. Quantitative Determination of Organochlorine Pesticides and Polycyclic Aromatic Hydrocarbons in Sewage Sludge. Skudai : Universiti Teknologi Malaysia, 2002.