APA (7th ed.) Citation

Vachon, B. (2012). CCNA Security (640-554) Portable Command Guide (1st edition.). Pearson Education.

Chicago Style (17th ed.) Citation

Vachon, Bob. CCNA Security (640-554) Portable Command Guide. 1st edition. S.l.: Pearson Education, 2012.

MLA (9th ed.) Citation

Vachon, Bob. CCNA Security (640-554) Portable Command Guide. 1st edition. Pearson Education, 2012.

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