CCNP Security SENSS Technology Workbook: Exam: 300-206
Essential Firepower: Your best practice guide to configuring Cisco's Next Generation Firewall
Cisco Firepower Threat Defense (FTD) (Networking Technology: Security)
CCNP Security SISAS 300-208 Official Cert Guide (Certification Guide)
CCNA Security 210-260 Certification Guide: Build your knowledge of network security and pass your CCNA Security exam (210-260)
Cisco Firepower Threat Defense(FTD) NGFW: An Administrator's Handbook : A 100% practical guide on configuring and managing CiscoFTD using Cisco FMC and FDM.
Cisco ASA: All-in-one Next-Generation Firewall, IPS, and VPN Services (3rd Edition)