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. .