2
Έκδοση 1988
Full text available from Consumer Health Database: 08/01/1998 to 03/31/2006
Full text available from Psychology Database: 08/01/1998 to 03/31/2006
Full text available from Research Library: 08/01/1998 to 03/31/2006
Full text available from Science Database: 08/01/1998 to 03/31/2006
Ηλεκτρονική πηγή Επιστημονικό περιοδικό