APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.