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Ahmed, Osumanu Haruna and Yap, Braine C. H. and Nik Ab. Majid, Nik Muhamad (2010) Minimizing ammonia loss from urea through mixing with zeolite and acid sulphate soil. International Journal of the Physical Sciences, 5 (14). pp. 2198-2202. ISSN 1992-1950

Abd. Khalid, Nur Nabilah (2016) Controlling urea-N release using wood waste materials. Doctoral thesis, Universiti Putra Malaysia.

Ahmmed, Md. Motasim (2022) Comparative efficiency of liquid and granular urea fertilizers on nitrogen dynamics, growth performance and yield of grain corn (Zea mays L.). Doctoral thesis, Universiti Putra Malaysia.

Hashim, Mohammad Mu'az (2016) Evaluation of enhanced efficient fertilizer urea on rice production and environment. Doctoral thesis, Universiti Putra Malaysia.

Junejo, Nasima (2011) Preparation and Characterization of Urea with Coated-Urea Materials and their Performance to Reduce Ammonia Volatilization and Improve Crop Production. PhD thesis, Universiti Putra Malaysia.

Lee, Jia Huey (2011) Effects of peat derived humic acid on ammonia volatilization from urea fertilizer. Masters thesis, Universiti Putra Malaysia.

Mohd Zuki, Muhammad Muhaymin (2020) Effects of coated and incorporated N-(n-butyl) thiophosphoric triamide urea-nitrogen dynamics in soils on growth and yield of maize (Zea mays L. var. thai super sweet). Masters thesis, Universiti Putra Malaysia.

Said, Nur Fazlina (2012) Effectiveness of sulfur-coated and uncoated urea fertilizers as nitrogen sources for rice. Masters thesis, Universiti Putra Malaysia.