http://books.google.pt/books?id=BPjKHKTJe1wC&pg=PA305&dq=yoga&lr=lang_pt&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&as_brr=3&as_pt=ALLTYPES&ei=28kPSuG5LYPuzQTLnMylCw#PPP1,M1
http://books.google.pt/books?id=MDlo_dxLAtoC&pg=PA39&dq=yoga&lr=lang_pt&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&as_brr=3&as_pt=ALLTYPES#PPA202,M1
http://books.google.pt/books?id=m_Ji_XI8W5UC&pg=PA74&dq=yoga&lr=lang_pt&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&as_brr=3&as_pt=ALLTYPES#PPA76,M1