Please find the links to the latest (June, 2013) WHO Guidelines on ART for HIV Infection below:
http://www.who.int/mediacentre/news/releases/2013/new_hiv_recommendations_20130630/en/index.html
http://apps.who.int/iris/bitstream/10665/85321/1/9789241505727_eng.pdf
http://www.who.int/hiv/pub/guidelines/arv2013/15facts/en/index.html#