Denny, Agustinus, 		Dalimunthe, Femmy, AND 		Wiharjokusumo, Padriadi.
" Pengaruh Penerapan Cleanliness, Health, Safety, dan Environmental sustainability terhadap Kepuasan Tamu di Hotel Harper Wahid Hasyim Medan" <em>JURNAL PROINTEGRITA</em> [Online], Volume 6 Number 3 (6 December 2022)