Davies, Jane, Hallam, Susan and Ireson, Judith (2003) Ability groupings in the primary school: issues arising from practice. Research Papers in Education, 18 (1). pp. 45-60. ISSN 02671522

Davies, Jane, Hallam, Susan and Ireson, Judith (2002) Effective Pupils Grouping in the Primary School. David Fulton Publishers. ISBN 1853468495