1. A. Rahadi, et al, European Journal of Business and Management Researc. 5 1–7 (2020)
2. P. Swiecka, et al Sustainability 13 6401 (2021)
3. A. Yang, et al, Sustainability 13 1–18.( 2021)
4. S. Rochemont, Institute and Faculty of Actuaries (2018)
5. Bank Indonesia, Laporan Perekonomian Indonesia 2020 (2020)