Yudiana, Dewi, Adi Hartono, and Herix Sonata MS3. 2023. “Validation of Amphetamine and Methamphetamine Measurement Method by Gas Chromatography-Mass Spectrometry”. International Journal of Advanced Multidisciplinary 2 (2):637-46. https://doi.org/10.38035/ijam.v2i2.343.