APA (7th ed.) Citation

Barker, K. (2012). CCNA Security 640-554 LiveLessons (Video Training) (1st edition.). Pearson IT Certification.

Chicago Style (17th ed.) Citation

Barker, Keith. CCNA Security 640-554 LiveLessons (Video Training). 1st edition. Pearson IT Certification, 2012.

MLA (9th ed.) Citation

Barker, Keith. CCNA Security 640-554 LiveLessons (Video Training). 1st edition. Pearson IT Certification, 2012.

Warning: These citations may not always be 100% accurate.