1
Έκδοση 1980
Full text available from Psychology Database: 07/01/2014 to present
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
2
Έκδοση 1988
Full text available from Consumer Health Database: 08/01/1998 to 03/31/2006
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
3
Έκδοση 2000
Full text available from Psychology Database: 04/01/2000 to 12/31/2003
Ηλεκτρονική πηγή Επιστημονικό περιοδικό