Dyfyniad APA

British standards institutions. (1977). Handbook for information systems and services. UNESCO.

Dyfyniad Arddull Chicago

British standards institutions. Handbook for Information Systems and Services. Paris: UNESCO, 1977.

Dyfyniad MLA

British standards institutions. Handbook for Information Systems and Services. UNESCO, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.