Open Source Intelligence Methods and Tools:Practical Guide Online Intelligence

Open Source Intelligence Techniques: Resources for Searching and Analyzing O...

Hacking Web Intelligence: Open Source Intelligence and Web Reconnaissance...

Silence on the Wire: A Field Guide to Passive Reconnaissance and Indirect Attack

The Hacker Playbook 3: Practical Guide To Penetration Testing - Kim, Peter (a28)

Open Source Intelligence Methods and Tools by Hassan Hijaz

Fundamentals of Physics Extended by Halliday

PostgreSQL: up and Running : A Practical Guide to the Advanced Open Source...