1. International Programme on Chemical Safety;WHO (World Health Organization),1999
2. Ambient (Outdoor) Air Quality and Health, Geneva, Switzerland;WHO (World Health Organization),2014
3. Agency for Toxic Substances and Disease Registry (ATSDR), http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=252&tid=46.
4. Method of test for sulfur dioxide in foods, No. 1021950329, Food and Drug Administration,2013
5. Rapid determination of formaldehyde and sulfur dioxide in food products and Chinese herbals;Wang;Food Chem.,2007