Enlaces:
[1] http://bvs.sld.cu/revistas/mciego/vol19_no2_2013/pdf/T30.pdf
[2] http://www.gtm.sld.cu/sitios/cpicm/contenido/ric/textos/Vol_70_No.2/parchispeak_alternativa_didactica_tc.pdf
[3] http://scielo.sld.cu/pdf/ccm/v17n2/ccm08213.pdf
[4] http://revcocmed.sld.cu/index.php/cocmed/article/view/297/349
[5] http://www.revcocmed.sld.cu/index.php/cocmed/article/view/254/219
[6] http://www.revmatanzas.sld.cu/revista medica/ano 2014/vol3 2014/tema13.htm