@book{10120, author = {Organization of the Petroleum Exporting Countries (OPEC)}, title = {Annual statistical bulletin }, publisher = {OPEC,}, year = {1978}, address = {Viena:}, note = {Impreso 07873 al 07893, 07995 al 07997, 08001, 08829, 08916, 09955 Existencias: 1977-2015( )}, url = {http://www.opec.org/opec_web/static_files_project/media/downloads/publications/ASB2015.pdf} }