Tin Duc Nguyen, Le Phuc Hai, Nguyen Le Thi Ngoc Chau. EXPLORING THE IMPLICIT IMPACT OF SUSTAINABILITY CERTIFICATIONS ON SERVICE QUALITY EXPECTATIONS: A NETNOGRAPHIC STUDY OF UPSCALE HOTELS IN HO CHI MINH CITY. HUIT_OJS. 2026;26(3E):2100. doi:10.62985/j.huit_ojs.vol26.no3E.620