BS 5228: Part 1: 1997 (with Amendment 1),ISBN 0 580 26845 4,
BS 5228: Part 3: 1997,ISBN 0 580 26874 8,
BS 5228: Part 4: 1992,ISBN 0 580 20381 6,
BS 5228: Part 5: 1997,ISBN 0 580 28306 2,