Sustainable campuses: Building self-efficacy among academic, staff, and students of Green Office ModelNuphanudin Nuphanudin, Helda Kusuma Wardani, Asep Iwa Sumantri, Erny Roesminingsih, Pramudya Cahyandaru and Umi SalamahE3S Web Conf., 450 (2023) 01004DOI: https://doi.org/10.1051/e3sconf/202345001004