Machado, A. C. T. A., Guimarães, S. E. R. and Bzuneck, J. A. (2006) “The teacher’s motivational style and the students’ extrinsic motivation”, Semina: Ciências Sociais e Humanas, 27(1), pp. 03–13. doi: 10.5433/1679-0383.2006v27n1p03.