Whitelaw, K. (1997). ISO 14001 environmental systems handbook. Butterworth Heinemann.
Lua i Stíl Chicago (17ú heag.)Whitelaw, Ken. ISO 14001 Environmental Systems Handbook. Oxford; Boston: Butterworth Heinemann, 1997.
Lua MLA (9ú heag.)Whitelaw, Ken. ISO 14001 Environmental Systems Handbook. Butterworth Heinemann, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.