Ibrahim, M. H., Jaafar, H., Rahmat, A., & Abdul Rahman, Z. (2011). Effects of nitrogen fertilization on synthesis of primary and secondary metabolites in three varieties of Kacip Fatimah (Labisia Pumila Blume). MDPI.

Ibrahim, Mohd Hafiz, Hawa Jaafar, Asmah Rahmat, and Zaharah Abdul Rahman. Effects of Nitrogen Fertilization On Synthesis of Primary and Secondary Metabolites in Three Varieties of Kacip Fatimah (Labisia Pumila Blume). MDPI, 2011.

Ibrahim, Mohd Hafiz, Hawa Jaafar, Asmah Rahmat, and Zaharah Abdul Rahman. Effects of Nitrogen Fertilization On Synthesis of Primary and Secondary Metabolites in Three Varieties of Kacip Fatimah (Labisia Pumila Blume). MDPI, 2011.