Ecopetrol : www.ecopetrol.com.co

BP: www.bp.com

National Agency of Hydrocarbons: www.anh.gov.co

Colombian Central Bank: www.banrep.gov.co

Taxes and National Customs Department: www.dian.gov.co

Mines and Energy Department: www.minminas.gov.co

Treasury and Public Credit Department: www.minhacienda.gov.co

Official Newspaper of Colombia: www.imprenta.gov.co

Labor and Social Security Department: www.minproteccionsocial.gov.co

Industry and Commerce Supervisor: www.sic.gov.co

Proexport: www.proexport.com.co

ICONTEC: www.icontec.org.co

Colombian Security Council (CCS): www.laseguridad.ws

El Tiempo: www.eltiempo.com

Portafolio (Economic Newspaper): www.portafolio.com.co