APA استشهاد

Cohn J M. (1961). Universal Decimal Classification English Abridged edition 1961 (Photocopy) (3.). British standards Institution.

استشهاد بنمط شيكاغو

Cohn J M. Universal Decimal Classification English Abridged Edition 1961 (Photocopy). 3. London: British standards Institution, 1961.

MLA استشهاد

Cohn J M. Universal Decimal Classification English Abridged Edition 1961 (Photocopy). 3. British standards Institution, 1961.