Silfiyah, A., T. . Harris, and M. F. . Wahyudi. “Integrasi Nilai-Nilai Karakter Abad 21 (4c: Critical Thinking, Creativity, Communication, Collaboration) Melalui Metode Deep Learning Dalam Pembelajaran Pendidikan Kewarganegaraan Di SMK”. TOFEDU: The Future of Education Journal, vol. 4, no. 9, Dec. 2025, pp. 5389-95, doi:10.61445/tofedu.v4i9.1408.