Grigonis, Richard (2000). "Open Systems Interconnection (OSI) Model". Computer Telephony Encyclopedia. New York: CMP Books. p. 331. ISBN978-1-929629-51-0. OCLC48138823.
Mao, Stephen (2009). "Chapter 8: Fundamentals of communication networks". In Wyglinski, Alexander; Nekovee, Maziar; Hou, Thomas (eds.). Cognitive Radio Communications and Networks: Principles and Practice. Elsevier. p. 201. ISBN978-0-08-087932-1. OCLC635292718, 528550718. Partial preview at Google Books.
Grigonis, Richard (2000). "Open Systems Interconnection (OSI) Model". Computer Telephony Encyclopedia. New York: CMP Books. p. 331. ISBN978-1-929629-51-0. OCLC48138823.
Mao, Stephen (2009). "Chapter 8: Fundamentals of communication networks". In Wyglinski, Alexander; Nekovee, Maziar; Hou, Thomas (eds.). Cognitive Radio Communications and Networks: Principles and Practice. Elsevier. p. 201. ISBN978-0-08-087932-1. OCLC635292718, 528550718. Partial preview at Google Books.