British Standards Institution. (1968). Universal decimal classification: UDC 77 Photography (English full ed.). British Standards Institution.
Chicago-referens (17:e uppl.)British Standards Institution. Universal Decimal Classification: UDC 77 Photography. English full ed. London: British Standards Institution, 1968.
MLA-referens (8:e uppl.)British Standards Institution. Universal Decimal Classification: UDC 77 Photography. English full ed. British Standards Institution, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.