1) Maximum weight in load lifting and carrying (1983) Occupational Safety and Health Series No. 59, ILO.
2) Ayoub MM (1992) Problems and solutions in manual materials handling: The state of the art. Ergonomics 35, 713-28.
3) Veturi SM, Lakshmi BA, Ganguli AK, Chakrabarti AK (1987) The impact and feasibility of international/national standards in the prevention of musculoskeletal injuries in developing countries. Ergonomics 30, 405-10.
4) Edwards FC (1987) Prevention of musculoskeletal injuries in the workplace. National approaches to safety standards: Great Britain. Ergonomics 30, 411-7.
5) Work practice guide for manual lifting (1981) NIOSH.