Gaya APA

Valentine, M., Barker, K. (2014). Cisco CCNA routing and switching 200-120 Exam Cram, Fourth Edition (Ed.ke-4). : Pearson Education.

Gaya MLA

Valentine, Michael., Barker, Keith. "Cisco CCNA routing and switching 200-120 Exam Cram, Fourth Edition". Ed.ke-4 : Pearson Education, 2014. Textbook.