Ashari, A., and C. Ciptati. “Isolation of Essential Oils from Essential Roots (Vetiveria Zizanoides L.) With Preparation Using Liquid Nitrogen”. Stannum : Jurnal Sains Dan Terapan Kimia, Vol. 1, no. 1, Oct. 2019, pp. 20-24, doi:10.33019/jstk.v1i1.1418.