81
Published 2008
OECD Publishing

82
Published 2010
European Commission, Joint Research Centre

83
Published 2006
Korea Institute for Special Education

85
Published 1998
OECD Publishing

87
Published 2007
OECD Publishing

89
Published 2005
OECD Publishing

90
Published 2008
OECD Publishing

91
Published 2008
OECD Publishing

93
Published 2008
OECD Publishing

95
Published 2005
OECD Publishing

96
Published 1993
OECD Publishing

97
Published 2018
OECD Publishing

100
Published 2000
OECD Publishing