"Open-source intelligence (OSINT) has been a crucial part of intelligence gathering and analysis for centuries, long before the advent of the internet. This article will explore the historical use of OSINT, providing some examples of its application. [...] "

 The Historical Use of OSINT Through The Centuries | IMSL (intelmsl.com)

(dostęp z 7.05.2024)

 Wykorzystanie-otwartych-zrodel.pdf (uw.edu.pl)

(dostęp z 7.05.2024)