http://en.wikipedia.org/wiki/1,1,1,2-Tetrafluoroethane

http://www.aa1car.com/library/retrofit.htm

http://www.nextag.com/r134a/search-html

http://www.thefind.com/appliances/info-r134a-oil-charge

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http://www.griffiths.com/achelp/achelp3.html

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http://www.jcwhitney.com/jcwhitney/product.jcw?nval=0&statenval=0&productId=2010846&shopid=100001&pageid=13&skuId=220492

http://www.nextag.com/r134a-refrigerant/search-html