http://www.letralia.com/firmas/rojasclea.htm http://www.saber.ula.ve/cgi-win/be_alex.exe?Documento=U01630001147/&term_termino_2=e:/alexandr/db/ssaber/Edocs/Curriculum/Humanidades/crojas.pdf&term_termino_3=&Nombrebd=saber
http://www.saber.ula.ve/cgi-win/be_alex.exe?Documento=U01630001147/&term_termino_2=e:/alexandr/db/ssaber/Edocs/Curriculum/Humanidades/crojas.pdf&term_termino_3=&Nombrebd=saber