Sagala, Irwan Pernandi, Delfitri Munir, Andriana Yunita Murni Rambe, and Taufik Ashar. 2018. “The Difference of Olfactory Functions in The Workers of The Gas Station by Using Sniffin’ Stickstest in Medan City”. Sumatera Medical Journal 1 (1):49-55. https://doi.org/10.32734/sumej.v1i1.446.