APA

British Standard 873:1976[1970]:1, . (1976). Construction of road traffic signs and internally illuminated bollards. Specification. Part 1. General traffic signs. London: British Standard 873:1976[1970]:1.

Chicago

British Standard 873:1976[1970]:1, . 1976. Construction of road traffic signs and internally illuminated bollards. Specification. Part 1. General traffic signs. London: British Standard 873:1976[1970]:1.

Harvard

British Standard 873:1976[1970]:1, . (1976). Construction of road traffic signs and internally illuminated bollards. Specification. Part 1. General traffic signs. London: British Standard 873:1976[1970]:1.

MLA

British Standard 873:1976[1970]:1, . Construction of road traffic signs and internally illuminated bollards. Specification. Part 1. General traffic signs. London: British Standard 873:1976[1970]:1. 1976.