- Uusitalo-malmivaara, L.
- Happiness Decreases during Secondary School: A Longitudinal Study on Early Adolescents
- Sarracino, F (Ed.): " The Happiness Compass" , 2013, Nova Science Publishers, New York, United States of America, 93-109
- English (Australia, Canada, UK, USA)
Eligible for inclusion in findings archive
- No, no valid measure of happiness used.