@book{ VILLEN_Baltar-Gómez_Labella-Rivas,

author = { LUIS VILLEN RUEDA and Ana Baltar-Gómez and Fabiola Labella-Rivas } ,

title = { ISBD (A) },

publisher = { Anabad },

year = { 1993 },

isbn = { 84-88716-02-8 },

}