Chu, A. (2019). CCNA Cyber Ops SECOPS certification guide 210-255: Learn the skills to pass the 210-255 certification exam and become a competent SECOPS associate. Packt Publishing, Limited.

Chu, Andrew. CCNA Cyber Ops SECOPS Certification Guide 210-255: Learn the Skills to Pass the 210-255 Certification Exam and Become a Competent SECOPS Associate. Birmingham: Packt Publishing, Limited, 2019.

Chu, Andrew. CCNA Cyber Ops SECOPS Certification Guide 210-255: Learn the Skills to Pass the 210-255 Certification Exam and Become a Competent SECOPS Associate. Packt Publishing, Limited, 2019.