(2010) Practical Lock Picking, Second Edition: A Physical Penetration Tester's Training Guide https://www.amazon.com/Practical-Lock-Picking-Second-Edition/dp/1597499897
(2012) Keys to the Kingdom: Impressioning, Privilege Escalation, Bumping, and Other Key-Based Attacks Against Physical Locks https://www.amazon.com/Keys-Kingdom-Impressioning-Privilege-Escalation/dp/1597499838