Satarida Yusardi, Deliah Nur, and Henny Saptatia. “Aliansi Pertahanan Negara-Negara Kawasan Laut Baltik”. Jurnal Pendidikan Tambusai, vol. 6, no. 2, July 2022, pp. 13988-94, doi:10.31004/jptam.v6i2.4658.