By PETROECUADOR.
Ecuador | QUITO PETROECUADOR 1996 .
66

By BOCCO, ARNALDO M..
Ecuador | QUITO CORPORACION EDITORA NACIONAL 1987 .
265 , BIBLIOTECA DE CIENCIAS SOCIALES

By CACERES, JOSE.
Ecuador | QUITO PETROECUADOR 1990 .
196 , TEMAS DE AUTOCAPACITACION PETROLERA

By LLANEZ SUAREZ, HENRY.
Ecuador | QUITO S.E. 2004 .
158 997843447X

By ESTRADA RUIZ, JENNY.
Ecuador | GUAYAQUIL ESPOL 2001 .
302 p. 997841794X

By MARTINEZ, ESPERANZA.
Ecuador | QUITO ABYA -YALA 2009 .
116 9789978228715

By ESTRADA RUIZ, JENNY.
Ecuador | GUAYAQUIL POLIGRAFICA 2010 .
339 9789942036797