Voorhees, J. (1998). International environmental risk management ISO 14000: And the systems approach. Lewis.
Chicago-čujuhus (17. p.)Voorhees, John. International Environmental Risk Management ISO 14000: And the Systems Approach. Boca Raton: Lewis, 1998.
MLA-čujuhus (9. p.)Voorhees, John. International Environmental Risk Management ISO 14000: And the Systems Approach. Lewis, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.