1. State of California Air Resource Board. Technical support document for the "Proposed Identification of Environmental Tobacco Smoke as a Toxic Air Contaminant, Part A: California Environmental Protection Agency, Air Resources Board, Office of Environmental Health Hazard Assessment; 2006. http://www.arb.ca.gov/regact/ets2006/ets2006.htm (accessed 13 Apr 2013).
2. The Global Smoke-free Partnership. Global map of smoke-free laws. 2003. http://www.globalsmokefreepartnership.org/index.php?section=article&artigo=32 (accessed 13 Apr 2013).