Samad N.A., Abang Zaidel D.N., Salleh E., Mohd Yusof A.H., Dailin D.J., Abang Zaidel D.N., 2019, Optimization of Plectranthus amboinicus (Lour.) Spreng Extraction Process using Microwave-Assisted Technique, Chemical Engineering Transactions, 72, 397-402.