« Payment systems in the European Union - Addendum incorporating 1995 figures » (" Blue Book » addendum ) , January 1997 .
 ÓõóôÞìáôá ðëçñùìþí óôçí ÅõñùðáúêÞ ¸ íùóç - ÓõìðëÞñùìá ìå óôïé ÷ åßá ãéá ôï 1995  ( ÓõìðëÞñùìá ôçò  ÊõáíÞò Âßâëïõ ) , ÉáíïõÜñéïò 1997 .