APA

British Standard 3049:1976, . (1976). Pedestrian guard rails (metal). London: British Standard 3049:1976.

Chicago

British Standard 3049:1976, . 1976. Pedestrian guard rails (metal). London: British Standard 3049:1976.

Harvard

British Standard 3049:1976, . (1976). Pedestrian guard rails (metal). London: British Standard 3049:1976.

MLA

British Standard 3049:1976, . Pedestrian guard rails (metal). London: British Standard 3049:1976. 1976.