APA Citation

 Lammle, T. (2006).  CCNA intro: Introduction to Cisco networking technologies : study guide.  Wiley.

Chicago Style Citation

 Lammle, Todd.  CCNA Intro: Introduction to Cisco Networking Technologies : Study Guide.  Wiley, 2006.

MLA Citation

 Lammle, Todd.  CCNA Intro: Introduction to Cisco Networking Technologies : Study Guide.  Wiley, 2006.

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