Ningtyas WD, Nastiti D. The Relationship Between Achievement Motivation and Academic Flow in Middle School Students of Muhammadiyah 8 Tanggulangin Sidoarjo during the Covid-19 Pandemic: Hubungan Antara Motivasi Berprestasi dengan Flow Akademik pada Siswa Sekolah Menengah Pertama Muhammadiyah 8 Tanggulangin Sidoarjo pada Masa Pandemi Covid-19. jims [Internet]. 2022 Feb. 22 [cited 2025 Sep. 1];2:10.21070/jims.v2i0.1541. Available from: https://jims.umsida.ac.id/index.php/jims/article/view/1541