(2003) "Object-Oriented Application Development Using the Caché Postrelational Database" ISBN 3-540-00960-4* Martínez de Carvajal Hedrich, Ernesto (1993).
(2003) "Object-Oriented Application Development Using the Caché Postrelational Database" ISBN 3-540-00960-4*Martínez de Carvajal Hedrich, Ernesto (1993).