Unfortunately Retarded is a redirect, not an article. For more than GLAAD, see also: 
 *http://www.safeschoolscoalition.org/RG-glbt-defined.html 
 *http://www.guardian.co.uk/styleguide/0,5817,184913,00.html 
 *http://www.apastyle.org/sexuality.html 
 *http://newswatch.sfsu.edu/guide/g.html