Nurul Hajar, E., Noor, H., Prakash, B., Govindan, N., Mohd Hasbi, A. R., & Gaanty Pragas, M. (2021). Enhanced biodiesel production via esterification of palm fatty acid distillate (PFAD) using rice husk ash (NiSO4)/SiO2 catalyst. Springer Berlin Heidelberg.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Nurul Hajar, Embong, Hindryawati Noor, Bhuyar Prakash, Natanamurugaraj Govindan, Ab Rahim Mohd Hasbi, و Maniam Gaanty Pragas. Enhanced Biodiesel Production via Esterification of Palm Fatty Acid Distillate (PFAD) Using Rice Husk Ash (NiSO4)/SiO2 Catalyst. Springer Berlin Heidelberg, 2021.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Nurul Hajar, Embong, et al. Enhanced Biodiesel Production via Esterification of Palm Fatty Acid Distillate (PFAD) Using Rice Husk Ash (NiSO4)/SiO2 Catalyst. Springer Berlin Heidelberg, 2021.