http://tesis.pucp.edu.pe/repositorio/bitstream/handle/123456789/74/ARREDONDO_BAQUERIZO_FREDER_DUALIDAD_SIMBOLICA.pdf?sequence=1

http://repositorio.utn.edu.ec/bitstream/123456789/1191/3/06%20ENF%20457%20TESIS.pdf

http://books.google.com.ec/books?id=1DKiBkoiqdQC&pg=PA167&dq=El+uso+de+las+plantas+m%C3%A1gicas+por+los+curanderos&hl=es&sa=X&ei=n5lJU6TaD-HN0gHEk4CIDQ&ved=0CDkQ6AEwAg#v=onepage&q=El%20uso%20de%20las%20plantas%20m%C3%A1gicas%20por%20los%20curanderos&f=false