H. S. P. Sihombing, J. Junita, and S. Z. Saragih, “The role of PPKN teachers in implementing the third Pancasila value in instilling an attitude of defending the country in class X students of SMA Negeri 2 Kajangan”, EJR, vol. 5, no. 2, pp. 157–166, Mar. 2026.