3
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
5
Έκδοση 2001
Full text available from Health & Medical Collection: 03/01/1998 to 12/01/2001
Full text available from Psychology Database: 03/01/1998 to 12/01/2001
Full text available from Science Database: 03/01/1998 to 12/01/2001
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
6
Έκδοση 1983
Available in Education Source.
Ηλεκτρονική πηγή Επιστημονικό περιοδικό