Effect of size and drying of critronella grass on extraction of citronella oil using hydro and steam distillation / by Noorhalieza Ali, Hefeza Abu Bakar, author, Noraini Zainudin, author, HidayahIsmail, author, Onn Hassa, author, Syaposium of Malaysia Chamical Engineering (2an : 2009 : Sabah)i