Cita APA (7a ed.)

OSITOP & Technology Appraisals Ltd. (1991). ISDN: What users need to know. Technology Appraisals.

Cita Chicago Style (17a ed.)

OSITOP y Technology Appraisals Ltd. ISDN: What Users Need to Know. Isleworth: Technology Appraisals, 1991.

Cita MLA (9a ed.)

OSITOP y Technology Appraisals Ltd. ISDN: What Users Need to Know. Technology Appraisals, 1991.