Richardson, M. (1992). Risk management of chemicals. Royal society of chemistry.
Chicago Style aipamenaRichardson, Mervyn. Risk Management of Chemicals. Cambridge: Royal society of chemistry, 1992.
MLA aipamenaRichardson, Mervyn. Risk Management of Chemicals. Royal society of chemistry, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.