1. P. Keterampilan Belajar Di Abad et al., “Pentingnya Keterampilan Belajar di Abad 21 sebagai Tuntutan dalam Pengembangan Sumber Daya Manusia,” Lect. J. Pendidik., vol. 12, no. 1, pp. 29–40, Feb. 2021, doi: https://doi.org/10.31849/LECTURA.V12I1.5813.
2. L. Greenstein, “Beyond the Core: Assessing Authentic 21st Century Skills.,” Princ. Leadersh., vol. 13, no. 4, pp. 36–42, Dec. 2012.
3. S. Zubaidah, “Research-based on Herbs Exploration and Use of Animal Models : Nature Materials Towards Supporting Evidence Based Medicine View project Genetics mapping on local rice varieties View project,” 2019, Accessed: Dec. 12, 2022. [Online]. Available: https://www.researchgate.net/publication/336065211
4. “ERIC - ej889143 - ‘21st-Century’ Skills: Not New, but a Worthy Challenge, American Educator, 2010.” https://eric.ed.gov/?id=ej889143 (accessed Dec. 10, 2022).
5. K. Insani, “Upaya Meningkatkan Kualitas Pembelajaran Akuntansi Melalui Penerapan Model Pembelajaran Kooperatif Teknik Mencari Pasangan (Make A Match) Pada Siswa Kelas Xi Ilmu Sosial 2 Sma Negeri 1 Ngemplak Boyolali Tahun Pelajaran 2010/2011 (Penelitian Tindakan Kelas,” 2011, Accessed: Dec. 10, 2022. [Online]. Available: https://digilib.uns.ac.id/dokumen/23066/Upaya-Meningkatkan-Kualitas-Pembelajaran-Akuntansi-Melalui-Penerapan-Model-Pembelajaran-Kooperatif-Teknik-Mencari-Pasangan-Make-A-Match-Pada-Siswa-Kelas-Xi-Ilmu-Sosial-2-Sma-Negeri-1-Ngemplak-Boyolali-Tahun-Pelajaran-20102011-Penelitian-Tindakan-Kelas