Gaya APA

Environmental management systems : a step-by-step guide to implementation and maintenance [sumber elektronik] / Christopher Sheldon and Mark Yoxon. (2006). : .

Gaya MLA

Environmental management systems : a step-by-step guide to implementation and maintenance [sumber elektronik] / Christopher Sheldon and Mark Yoxon. Ed. Ke- 3. : , 2006. Text.