http://www.ibo.org/contentassets/5895a05412144fe890312bad52b17044/cas-2016-english-1st-final-web.pdf
http://www.ibo.org/contentassets/5895a05412144fe890312bad52b17044/extended-essay-brief-2016-en.pdf
http://www.ibo.org/globalassets/publications/recognition/core_tok.pdf