Denny, Agustinus, Femmy Indriany Dalimunthe, & Padriadi Wiharjokusumo. " Pengaruh Penerapan Cleanliness, Health, Safety, dan Environmental sustainability terhadap Kepuasan Tamu di Hotel Harper Wahid Hasyim Medan." JURNAL PROINTEGRITA [Online], 6.3 (2022): 112 - 126. Web. 23 Nov. 2024