[youtube]http://www.youtube.com/watch?v=Mac8reC5O8U&feature=related[/youtube]

[youtube]http://www.youtube.com/watch?v=TBI3LZ3iesU&feature=related[/youtube]

http://inteligenciaecologica.blogspot.com/

http://books.google.com.co/books?id=0dbogd8DEigC&pg=PA148&dq=TQEM&lr=#PPP1,M1

http://books.google.com.co/books?id=_4uvqCO6KOYC&pg=PA41&dq=TQEM&lr=#PPP1,M1

http://books.google.com.co/books?id=Dr0UY1JEImUC&pg=PT339&dq=TQEM&lr=#PPA1,M1

http://books.google.com.co/books?id=LSJQ5z1cWwoC&pg=PA436&dq=TQEM&lr=#PPP1,M1