Gaya APA
Topic digital thephony. (1981).
:
Siemens Aktieng Essellschaft.
Gaya Chicago
Topic digital thephony.
.
:
Siemens Aktieng Essellschaft,
1981.
.
Gaya MLA
Topic digital thephony.
.
:
Siemens Aktieng Essellschaft,
1981.
.
Gaya Turabian
Topic digital thephony.
:
Siemens Aktieng Essellschaft,
1981.
.