C. Evans

Evaluation of a home-based language training programme with severely mentally handicapped children.

J. Clements, C. Jones, G. Upton, 1982, Behaviour research and therapy.

SOUTH WALES EARLY LANGUAGE RESEARCH PROJECT: the development of a practicable, assessment-linked language training curriculum for use with the handicapped child

J. Clements, G. Upton, C. Evans, 2009 .