1. Ajzen, I. (1988). Attitudes, personality and behaviour. Milton Keynes, UK: Open University Press.
2. Ajzen, I. (1991). The theory of planned behaviour. Organizational Behaviour and Human Decision Processes, 50, 179–211.
3. Ajzen, I., & Fishbein, M. (1977). Attitude-behaviour relations: a theoretical analysis and review of empirical research. Psychological Bulletin, 84, 888–918.
4. Ajzen, I., & Fishbein, M. (1980). Understanding attitudes and predicting social behaviour. Englewood Cliffs, NJ: Prentice-Hall.
5. Allport, G. W. (1935). Attitudes. In C. Murchison (Ed.), A handbook of social psychologyn (pp. 798–844). Worcester, MA: Clark University Press.