Denny, Agustinus, Femmy Indriany Dalimunthe, & Padriadi Wiharjokusumo.
" Pengaruh Penerapan Cleanliness, Health, Safety, dan Environmental sustainability terhadap Kepuasan Tamu di Hotel Harper Wahid Hasyim Medan." <em>JURNAL PROINTEGRITA</em> [Online], 6.3 (2022): 112 - 126. Web.  2 May. 2024