LIBER, Janusz. Selected Aspects of Intelligence Services’ Recruitment of Sources in Online Environments: Characteristics, Threats and Countermeasures. Bezpieczeństwo. Teoria i Praktyka, [S. l.], n. 2, p. 89–100, 2026. DOI: 10.31749/2451-0718-btip-2026-2-005. Disponível em: https://journals.uafm.edu.pl/stp/article/view/387. Acesso em: 5 lis. 2026.