Gaya APA
Bellamy, John. (1990).
Digital Telephony Second Edition .
Canada:
John wiley & Sons Inc.
Gaya Chicago
Bellamy, John.
Digital Telephony Second Edition.
Canada:
John wiley & Sons Inc,
1990.
Text.
Gaya MLA
Bellamy, John.
Digital Telephony Second Edition.
Canada:
John wiley & Sons Inc,
1990.
Text.
Gaya Turabian
Bellamy, John.
Digital Telephony Second Edition.
Canada:
John wiley & Sons Inc,
1990.
Print.