Gaya APA

Eberspacher, J. et al (2001). GSM Switching Services and Protocols 2nd Edition eBook-TFC . Chichester: John Wiley & Sons.

Gaya MLA

Eberspacher, Jorg. et al. "GSM Switching Services and Protocols 2nd Edition eBook-TFC". Chichester: John Wiley & Sons, 2001. Text.