Digital Witness

Digital Witness: Using Open Source Information for Human Rights Investigation, Documentation, and Accountability is a must-read for anyone new or old to the field of OSINT and human rights investigations. The book goes into great detail about a number of various tools and methodologies. It teaches you about the importance of verification and archiving. Written by Sam Dubberley, Alexa Koenig, and Daragh Murray. Highly recommended.

Link to purchase the book