APA (7th ed.) Citation

(19). X.25 and related packet network protocols. [s.l] : Housely.

Chicago Style (17th ed.) Citation

X.25 and Related Packet Network Protocols. [s.l] : Housely, 19.

MLA (9th ed.) Citation

X.25 and Related Packet Network Protocols. [s.l] : Housely, 19.

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