The structure of anxiety and depression in a normative sample of younger and older Australian adolescents
Journal of Abnormal Child Psychology (2009) - Comment
pubmed: 19238534  doi: 10.1007/s10802-009-9306-4  issn: 1573-2835  issn: 0091-0627 

Phillip J. Tully, Ian T. Zajac, Anthony J. Venning