Cita APA (7th ed.)

British Standards Institution. (1977). Universal decimal classification (4th international ed.). British Standards Institution.

Cita Chicago (17th ed.)

British Standards Institution. Universal Decimal Classification. 4th international ed. London: British Standards Institution, 1977.

Cita MLA (8th ed.)

British Standards Institution. Universal Decimal Classification. 4th international ed. British Standards Institution, 1977.