Putra , Andika Bagus Nur Rahma, et al. “Hi World: The Virtual Book Learning Integrated Augmented Reality to Increase Knowledge of Covid-19 Prevention in The Learning Process Post-Pandemic Era”. International Journal of Interactive Mobile Technologies (iJIM), vol. 16, no. 06, Mar. 2022, pp. pp. 176-187, doi:10.3991/ijim.v16i06.29001.