Learning Applications about Standard Service Operational Procedures in Restaurants using Augmented Reality (AR)Arief Agus Sukmandhani, Eric Gunawan, Muhammad Raka Yusrifan, Indra Kusumawardhana and Ari YuniarsoE3S Web of Conf., 388 (2023) 02003DOI: https://doi.org/10.1051/e3sconf/202338802003