A Brief History of Open Source Intelligence
By Cameron Colquhoun
https://www.bellingcat.com/resources/articles/2016/07/14/a-brief-history-of-open-source-intelligence
A Tradecraft Primer: Structured Analytic Techniques for Improving Intelligence Analysis
By a CIA/Directorate of Intelligence Analyst
https://www.cia.gov/resources/csi/books-monographs/a-tradecraft-primer/
Bibliography of the most essential sources in Open Source Intelligence
By Arno H.P. Reuser
http://bib.opensourceintelligence.biz
Criminal Intelligence Manual for Analysts
By United Nations Office
https://www.unodc.org/documents/organized-crime/Law-Enforcement/Criminal_Intelligence_for_Analysts.pdf
Deep Dive: Exploring the Real-world Value of Open Source Intelligence 1st Edition
By Rae Baker
https://www.amazon.com/Deep-Dive-Exploring-Real-world-Intelligence/dp/1119933242
OSINT Techniques: Resources for Uncovering Online Information
By Michael Bazzell
https://www.amazon.com/OSINT-Techniques-Resources-Uncovering-Information/dp/B0BRDLYX75
Psychology of Intelligence Analysis
By Richards J. Heuer, Jr.
https://www.cia.gov/resources/csi/books-monographs/psychology-of-intelligence-analysis-2
By Cameron Colquhoun
https://www.bellingcat.com/resources/articles/2016/07/14/a-brief-history-of-open-source-intelligence
A Tradecraft Primer: Structured Analytic Techniques for Improving Intelligence Analysis
By a CIA/Directorate of Intelligence Analyst
https://www.cia.gov/resources/csi/books-monographs/a-tradecraft-primer/
Bibliography of the most essential sources in Open Source Intelligence
By Arno H.P. Reuser
http://bib.opensourceintelligence.biz
Criminal Intelligence Manual for Analysts
By United Nations Office
https://www.unodc.org/documents/organized-crime/Law-Enforcement/Criminal_Intelligence_for_Analysts.pdf
Deep Dive: Exploring the Real-world Value of Open Source Intelligence 1st Edition
By Rae Baker
https://www.amazon.com/Deep-Dive-Exploring-Real-world-Intelligence/dp/1119933242
OSINT Techniques: Resources for Uncovering Online Information
By Michael Bazzell
https://www.amazon.com/OSINT-Techniques-Resources-Uncovering-Information/dp/B0BRDLYX75
Psychology of Intelligence Analysis
By Richards J. Heuer, Jr.
https://www.cia.gov/resources/csi/books-monographs/psychology-of-intelligence-analysis-2