SITTIG, M. (1994). World-wide limits for toxic and hazardous chemicals inair, water and soil. Noyes Pub.
Lua i Stíl Chicago (17ú heag.)SITTIG, Marshall. World-wide Limits for Toxic and Hazardous Chemicals Inair, Water and Soil. New Jersey: Noyes Pub, 1994.
Lua MLA (9ú heag.)SITTIG, Marshall. World-wide Limits for Toxic and Hazardous Chemicals Inair, Water and Soil. Noyes Pub, 1994.
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