42
Full text available from ABI/INFORM Global: 01/01/1999 to 01/31/2018
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
43
Full text available from Education Database: 09/01/2006 to 09/30/2012
Full text available from Latin America & Iberia Database: 09/01/2006 to 09/30/2012
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
44
Full text available from Latin America & Iberia Database: 01/01/2013 to present
Full text available from Nursing & Allied Health Database: 01/01/2013 to present
Ηλεκτρονική πηγή Επιστημονικό περιοδικό
46
Έκδοση 2003
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47
Έκδοση 1998
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48
Full text available from Education Database: 01/01/2015 to present
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
49
Έκδοση 2003
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
50
Έκδοση 2002
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
51
Έκδοση 2008
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
53
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54
Full text available from Political Science Database: 09/01/2010 to 07/31/2014
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56
Έκδοση 1962
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Ηλεκτρονική πηγή Περιοδική έκδοση
57
Έκδοση 1978
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Ηλεκτρονική πηγή Περιοδική έκδοση
58
Έκδοση 2008
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59
Έκδοση 1997
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό
60
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Ηλεκτρονική πηγή Επιστημονικό περιοδικό