1. Arcury, T. A., & Christianson, E. H. (1990). Environmental worldview in response to environmental problems: Kentucky 1984 and 1988 compared.Environment and Behaviour, 22, 387–407.
2. Aron, A., Aron, E. N., & Smollan, D. (1992). Inclusion of other is self scale and the structure of interpersonal closeness: a procedure and some preliminary findings.Personality and Social Psychology Bulletin, 23, 363–377.
3. Baumgart, N., & Halse, C. (1999) Approaches to learning across cultures: the role of assessment,Assessment in Education, 6(3), 321–337.
4. Bechtel, R., Corral, V., & Pinheiro, J. (1997, July).The structure of environmental beliefs in students from three American countries: USA, Mexico and Brazil. Paper presented at the 26th Interamerican Congress of Psychology, Sao Paulo, Brazil.
5. Biggs, J. B. (1994). Approaches to learning: nature and measurement of. In T. Husen & T. N. Postlewaite (Eds.).The International Encyclopedia of Education. London: Pergamon.