Sutherland, R. (1987). A longitudinal study of the development of pupils' algebraic thinking in a LOGO environment. University of London, Institute of Education.

Sutherland, Rosamund. A Longitudinal Study of the Development of Pupils' Algebraic Thinking in a LOGO Environment. [London]: University of London, Institute of Education, 1987.

Sutherland, Rosamund. A Longitudinal Study of the Development of Pupils' Algebraic Thinking in a LOGO Environment. University of London, Institute of Education, 1987.