Gaya APA

Sitting, M. (1994). World-Wide Limits for Toxic and Hazardous Chemicals in Air, Water and Soil . United States of America: Noyes Publications.

Gaya MLA

Sitting, Marshall. "World-Wide Limits for Toxic and Hazardous Chemicals in Air, Water and Soil". United States of America: Noyes Publications, 1994. Text.