APA (7th ed.) Citation

Simpson, D., & Simpson, G. W. (1991). The COSHH regulations: A practical guide. Royal Society of Chemistry.

Chicago Style (17th ed.) Citation

Simpson, Diana, and Gordon W. Simpson. The COSHH Regulations: A Practical Guide. Cambridge: Royal Society of Chemistry, 1991.

MLA (9th ed.) Citation

Simpson, Diana, and Gordon W. Simpson. The COSHH Regulations: A Practical Guide. Royal Society of Chemistry, 1991.