Colin Holroyd

Method and apparatus for the manufacture of tires.

Colin Holroyd, Eric Holroyd, 1988 .

Primary teachers’ understanding of concepts of science: impact on confidence and teaching

Wynne Harlen, Colin Holroyd, W. Harlen, 1997 .

Are assessors professional?

Colin Holroyd, C. Holroyd, 2000 .

Primary teachers’ confidence about teaching science and technology

Wynne Harlen, Colin Holroyd, W. Harlen, 1996 .