APA (7th ed.) Citation

British Standards Institution. (1951). Fifty years of British standards 1901-1951. British Standards Institutions.

Chicago Style (17th ed.) Citation

British Standards Institution. Fifty Years of British Standards 1901-1951. London: British Standards Institutions, 1951.

MLA (8th ed.) Citation

British Standards Institution. Fifty Years of British Standards 1901-1951. British Standards Institutions, 1951.