APA Style

VALENTINE, J, C. (2012). Official Cert Guide learn,prepare,and practice for exam success/CCNA Voice 640-461 (1). United states of America: Cisco Press.

MLA Style

VALENTINE, JEREMY, CIOARA,MICHAEL. "Official Cert Guide learn,prepare,and practice for exam success/CCNA Voice 640-461". 1 United states of America: Cisco Press, 2012. BOOK.