A model of the relationships among measures of affect, aptitude, and performance in introductory statistics
Canadian Journal of Behavioural Science / Revue canadienne des sciences du comportement (2000) - Comment
doi: 10.1037/h0087099  issn: 1879-2669  issn: 0008-400x 

Paul F. Tremblay, R. C. Gardner, G. Heipel