1. Al-Balushi S. M., (2009), Factors influencing pre-service science teachers' imagination at the microscopic level in chemistry, Int. J. Sci. Math. Educ., 7, 1089–1110
2. Alexopoulou E. and Driver R., (1996), Small-group discussion in physics: peer interaction modes in pairs and fours, J. Res. Sci. Teach., 33, 1099–1114
3. Airasian P. W., Cruikshank K. A., Mayer R. E., Pintrich P. R., Raths J. and Wittrock M. C., (2001), in Anderson L. W. and Krathwohl D. R. (ed.), A taxonomy for learning, teaching and assessing: a revision of Bloom's taxonomy of educational objectives, New York: Longman
4. Arjoon J. A., Xu X. and Lewis J. E., (2013), Understanding the state of the art for measurement in chemistry education research: examining the psychometric evidence, J. Chem. Educ., 90, 536–545
5. Atkins P. and de Paula J., (2010), Atkins' Physical Chemistry, 9th edn, Oxford, New York: Oxford University Press