The impact of behavioural difficulty on the saliency of the association between self-determined motivation and environmental behaviours
Canadian Journal of Behavioural Science / Revue canadienne des sciences du comportement (1997) - Comment
doi: 10.1037/0008-400x.29.3.157  issn: 1879-2669  issn: 0008-400x 

Isabelle Green-Demers, Luc G. Pelletier, Sophie Ménard