Ningtyas, W. D., and D. Nastiti. “The Relationship Between Achievement Motivation and Academic Flow in Middle School Students of Muhammadiyah 8 Tanggulangin Sidoarjo During the Covid-19 Pandemic”. Journal of Islamic and Muhammadiyah Studies, Vol. 2, Feb. 2022, p. 10.21070/jims.v2i0.1541, doi:10.21070/jims.v2i0.1541.